Diablo 4: Codex Of Power [Ultimate Guide]

The Codex of Power in Diablo 4 is a brand-new game feature that contains 115 Legendary aspects for all 5 classes. These aspects provide bonus effects to your current builds in the early-game stages, making your overall skills, stats, gear, and weapon items robust, allowing you to take effective control in the combat environment. This guide covers getting Codex, its usage, differences, and all the Legendary aspects.

How To Access

They can be earned by completing specific dungeons throughout Sanctuary. You can access them via the collections menu, and they can be grouped by category. After getting the first one, you can mark other aspects’ dungeon locations by pinning them on your map and gathering them free of cost.

How To Use

To use Codex of Power in Diablo 4, you need to unlock Demyan the Occultist in Kyovashad by leveling up to 25, and once there, a priority quest for extraction and imprinting will pop up. The Occultist allows you to imprint or extract aspects on Rare and legendary tier items. Players can select an aspect from their Codex and imprint it onto Rare or Legendary gear, which transforms the Rare item into a Legendary one, enhancing its base stats and adding a bonus effect.

Best Usability Of Codex Aspects

First, fully upgrade your current Rare item at the Blacksmith by enchanting and equipping a suitable and powerful gem to get the best out of the Codex of Power aspects in Diablo 4. Once you do that, start imprinting on your Rare item to upgrade it to a Legendary. As a result, not only will this Rare imprint cost much less, but it will also secure you with a super-powerful Legendary, with the cherry on top of achieving the bonus effects of the upgraded version.

Codex & Extracted Aspects Differences

The Legendary aspects in Diablo 4 have unique and distinct features, making them different in contrast to the extracted aspects, which we have mentioned below:

Codex Aspects:

• They have unlimited uses, meaning they can be applied to your gears repeatedly without being discarded.
• They are pretty weak compared to extracted aspects from the dropped legendary or other tier gears, providing you with the lowest multiplier value of the additional stat.
• It cannot be sold.

Extracted Aspects:

• They are from dropped legendary or other tier items and can be obtained through extraction at the Occultist, costing you gold.
• Their extraction will permanently discard the gear piece from where it’s extracted.
• Unlike the Codex aspects, they can be sold as well.
• It can be only used once on your items and not repeatedly.
• They are collected in your inventory inside the Aspects tab, next to the Quest tab.

All Classes Codex Aspects

There are 5 categories of these Legendary aspects inside the Codex: defense, offense, resource, utility, and mobility for every class. Some of them are class-specific, while others apply to all classes. Adding on, these categories of aspects can be applied to specific gears and weapons allotted for them, and they can’t be stacked upon each other to get double benefits.

Defensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of the Deflecting Barrier	While you have an active barrier, there is a 7% chance to ignore incoming direct damage from distant enemies.	Lost Keep in Hawezar.
Aspect of Disobedience	Gain 0.25% increased armor for 4 seconds when dealing damage, stacking up to 25%.	Halls of the Damned in Kehjistan.
Aspect of Might	Basic Skills grant 20% damage reduction for 2 seconds.	Dark Ravine in Dry Steppes.
Aspect of the Protector	Damaging an Elite enemy grants you a barrier absorbing up to 315 damage for 10 seconds. It only happens once every 30 seconds.	Lost Archives in Fractured Peaks.

Offensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Rapid Aspect	Basic Skills gain 15% Attack Speed.	Buried Halls in Dry Steppes
Aspect of Retribution	Distant enemies have an 8% chance to be Stunned for 2 seconds when they hit you. You also deal 20% increased damage to Stunned enemies.	Abandoned Mineworks in Kehjistan.
Aspect of the Expectant	Attacking enemies with a Basic Skill increases the damage of your next Core Skill cast by 5% up to 30%.	Underroot in Scosglen.
Aspect of Inner Calm	Deal 5% increased damage for each second you stand still, up to 30%.	Raethwind Wilds in Scosglen.
Needleflare Aspect	Thorns damage has a 20% chance to land damage on all enemies near you.	Yshari Sanctum in Kehjistan.
Edge Master’s Aspect	Your skills do 10% increased damage when used, depending on your available Main Resource.	Oldstones in Scosglen.

Resource

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of the Umbral	Restore 1 of your Main Resources when you crowd-control an enemy.	Champion’s Demise in Dry Steppes.

Utility

Aspect Name	Description	Dungeon To Unlock Aspect From
Eluding Aspect	Getting injured during crowd control grants you unstoppable for 4 seconds. Cooldown: 40 seconds	Caldera Gate in Fractured Peaks.
Aspect of Shared Misery	Lucky Hit: When you attack a Crowd Controlled enemy, there’s a 30% chance for that Crowd Control effect to spread to another unaffected enemy.	Oblivion in Hawezar.

Mobility

Aspect Name	Description	Dungeon To Unlock Aspect From
Wind Striker Aspect	Critical Strikes give you 8% movement speed for 1 second up to 6 seconds.	Shivta Ruins in Kehjistan.
Ghostwalker Aspect	While unstoppable, you gain a 10% increased movement speed 4 seconds later and can move freely through enemies.	Broken Bulwark in Scosglen.

Codex Aspects For Sorcerer

Defensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Snowguard’s Aspect	While inside your own Blizzard, you take 10% less damage.	Fetid Mausoleum in Hawezar.
Aspect of the Unwavering	Taking direct damage has a 2% chance to reset the cooldown of one of your defensive skills.	Putrid Aquifer in Kehjistan
Snowveiled Aspect	Casting Ice Armor makes you unstoppable for 2 seconds.	Sarat’s Lair in Scosglen.

Offensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Control	Deal 25% more damage to Immobilized, Stunned, or Frozen enemies.	Sunken Library in Kehjistan.
Aspect of Three Curses	Meteor does 35% increased Critical Strike Damage against Healthy targets.	Serpent’s Lair in Hawezar.
Aspect of Static Cling	Casts of Charged Bolts have a 15% chance of being directed toward enemies and lasting 300% longer.	Wretched Delve in Scosglen.
Aspect of Biting Cold	A Frozen enemy has a 25% chance of being Vulnerable for 3 seconds.	Forgotten Depths in Dry Steppes.
Aspect of Piercing Cold	Ice Shards pierce 3 times, dealing 25% less damage per subsequent enemy hit.	Dead Man’s Dredge in Fractured Peaks.
Aspect of Conflagration	When channeling Incinerate, your burn damage increases by 20%.	Light’s Watch in Fractured Peaks.
Aspect of Splintering Energy	Lightning Spear can summon another Lightning Spear with an 11% chance once you use it.	Crumbling Hekma in Kehjistan.
Storm Swell Aspect	Land 11% increased damage to Vulnerable enemies with an active Barrier.	Onyx Hold in Dry Steppes.
Elementalist’s Aspect	Using Core or Mastery Skills at or above 100, Mana gains a 20% increase in Critical Strike Chance.	Pallid Delve in Dry Steppes.

Resource

Aspect Name	Description	Dungeon To Unlock Aspect From
Prodigy’s Aspect	Using a Cooldown restores 15 Mana.	Witchwater in Hawezar.
Incendiary Aspect	Lucky Hit: Burn damage has up to a 5% chance to restore 10 Mana.	Tomb of the Saints in Kehjistan.
Recharging Aspect	Each time Chain Lightning bounces off you, regain 4 Mana.	Zenith in Fractured Peaks.
Aspect of Efficiency	Casting a Basic skill reduces the Mana cost of your next Core skill by 10%.	Domhainne Tunnels in Scosglen.

Utility

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Singed Extremities	After immobilization wears off, enemies are slowed by 25% for 4 seconds.	Earthen Wound in Hawezar.

Mobility

Aspect Name	Description	Dungeon To Unlock Aspect From
Charged Aspect	Gathering Crackling Energy increases your movement speed by 10% for 4 seconds.	Maddux Watch in Scosglen
Aspect of the Bounding Conduit	Gain 20% movement speed for 3 seconds after Teleporting.	Komdor Temple in Dry Steppes.
Flamewalker’s Aspect	Coming in contact with your Firewall grants you 15% movement speed for 4 seconds.	Cultist Refuge in Fractured Peaks.

Codex Aspects For Rogue

The Codex of Power for Rogue in Diablo 4 has no specific mobility aspects assigned to this class.

Defensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Enshrouding Aspect	Gain a free Dark Shroud shadow every 3 seconds when standing still. Each shadow grants a 2% increased damage reduction.	Ghoa Ruins in Hawezar.
Aspect of Siphoned Victuals	Lucky Hit: Damaging a Vulnerable enemy with a Core skill has up to a 10% chance to drop a healing potion.	Leviathan’s Maw in Hawezar.
Aspect of Uncanny Treachery	Dealing direct damage to a Dazed enemy with an Agility skill grants stealth for 4 seconds. Breaking stealth with an attack grants you a 15% control-impaired duration reduction for 4 seconds.	Demon’s Wake in Scosglen.
Cheat’s Aspect	You take 15% less damage from crowd-controlled enemies. Whenever a crowd-controlled enemy inflicts direct damage to you, you gain 15% movement speed for 2 seconds.	Luban’s Rest in Scosglen.

Offensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Arrow Storms	Lucky Hit: Your Marksman skills have up to a 10% chance to create an arrow storm at the enemy’s location, dealing 259 physical damage over 3 seconds. You can have up to 5 arrow storms active.	Howling Warren in Scosglen.
Aspect of Encircling Blades	Flurry damages enemies in a circle around you and deals 8% increased damage.	Forsaken Quarry in Fractured Peaks.
Trickshot Aspect	Whenever a Penetrating Shot damages an enemy, 2 additional arrows split off to either side. These side arrows deal 10% of Penetrating Shot’s base damage and do not split.	Bastion of Faith in Hawezar.
Blast-Trapper’s Aspect	Lucky Hit: Dealing direct damage to enemies affected by your Trap skills has up to a 30% chance to make them Vulnerable for 3 seconds.	Kor Valar Ramparts in Fractured Peaks.
Vengeful Aspect	Lucky Hit: Making an enemy Vulnerable has up to a 30% chance to grant you a 3% increased Critical Strike chance for 3 seconds, up to 9%.	Inferno in Kehjistan.
Aspect of Branching Volleys	Barrage’s arrows have a 15% chance to split into 2 arrows whenever they ricochet.	Shadowed Plunge in Hawezar.
Aspect of Corruption	Imbuement Skill effects have 20% increased potency against Vulnerable enemies.	Renegade’s Retreat in Kehjistan.
Aspect of Unstable Imbuements	When casting an Imbeument skill, you trigger an imbued explosion around yourself, applying the imbuement effects and dealing 67 damage of the same type.	Whispering Vault in Dry Steppes.
Aspect of Volatile Shadows	When a Dark Shroud shadow is removed, you trigger an explosion around yourself that deals 26 shadow damage.	Ancient’s Lament in Dry Steppes.
Trickster’s Aspect	Caltrops now also throw a cluster of exploding stun grenades with 48 total physical damage and stun enemies for 0.5 seconds.	Gullrahn Canals in Dry Steppes.
Opportunist’s Aspect	When you break stealth with an attack, you drop a cluster of exploding stun grenades around your location that deals 173 total physical damage and stun enemies for 0.5 seconds.	Prison of Caldeum in Kehjistan.
Blade Dancer’s Aspect	Twisting Blades orbits for a short time after they return to you, dealing 10% of its return damage per hit. Based on the distance blades return, the orbit damage increases up to 20% of the return damage.	Jalal’s Vigil in Scosglen.
Shadowslicer Aspect	When you cast Dash, a Shadow Clone is spawned at your location that also casts Dash, dealing 25% of the base damage.	Twisted Hollow in Scosglen.

Resource

Aspect Name	Description	Dungeon To Unlock Aspect From
Ravenous Aspect	Killing a Vulnerable enemy gives you 50% increased energy regeneration for 4 seconds.	Shifting City in Dry Steppes.
Energizing Aspect	Damaging an elite enemy with a Basic skill regenerates 3 energy.	Sanguine Chapel in Fractured Peaks.

Utility

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Explosive Verve	Your Grenade skills count as Trap skills. Gain 10% increased movement speed for 3 seconds when you place a trap or drop grenades.	Derelict Lodge in Fractured Peaks.

Codex Aspects For Druid

Like Rogue, the Codex of Power for Druid in Diablo 4 also has no specific mobility aspects assigned to this class.

Defensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Vigorous Aspect	Gain 10% Damage Reduction while Shapeshifted into a Werewolf.	Steadfast Barracks in Hawezar.
Skinwalker’s Aspect	When you cast a Shapeshifting skill that changes your form, gain 11 life. You gain the same amount as Fortify if you’re at full life.	Fading Echo in Kehjistan.
Aspect of Cyclonic Force	Cyclone Armor additionally provides physical damage reduction. It will also be applied to all nearby allies.	Collapsed Vault in Kehjistan.
Aspect of Mending Stone	Earthen Bulwark duration is increased by 6 seconds. In addition, killing an enemy with Earth skills restores 11 of your active Earthen Bulwark’s Barrier.	Sealed Archives in Dry Steppes.

Offensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of the Changeling’s Debt	Damaging a poisoned enemy with a Werebear skill instantly deals 120% of the poison damage and consumes the poison.	Conclave in Kehjistan.
Nighthowler’s Aspect	Blood Howl increases Critical Strike Chance by 5%. It also affects nearby companions and players for 3 seconds.	Forbidden City in Fractured Peaks.
Aspect of the Ursine Horror	Pulverize also becomes an Earth skill. After casting it, tectonic spikes continue to deal 77 damage over 2 seconds.	Belfry Zakara in Hawezar.
Aspect of the Rampaging Werebeast	Grizzly Rage duration is increased by 1 second. When active, your Critical Strikes increase your Critical Strike Damage by 10% for the duration.	Endless Gates in Hawezar.
Aspect of the Tempest	Hurricane damage is increased by 7% each second when it’s active.	Blind Burrows in Hawezar.
Stormclaw’s Aspect	Critical Strikes with Shred deal 20% of the damage dealt as Lightning damage to the target and surrounding enemies.	Anica’s Claim in Fractured Peaks.
Overcharged Aspect	Lucky Hit: Up to a 10% chance to overload the target for 3 seconds when dealing Lightning damage, causing any direct damage you land on them to pulse 154 additional damage to nearby enemies	Mariner’s Refuge in Scosglen.
Shepherd’s Aspect	For every active companion, Core Skills deal an additional 6% damage.	Bloodsoaked Crag in Dry Steppes.
Aspect of Retaliation	Core Skills deal up to 20% increased damage based on the amount of your Fortify.	Seaside Decent in Dry Steppes.
Crashstone Aspect	Crowd Controlled Enemies take 30% increased Critical Strike Damage from Earth Skills.	Stockades in Scosglen.

Resource

Aspect Name	Description	Dungeon To Unlock Aspect From
Mangled Aspect	You have a 20% chance to gain 1 spirit when you’re hit as a Werebear.	Immortal Emanation in Fractured Peaks.
Aspect of the Unsatiated	After killing an enemy with Shred, your next Werewolf Skill generates 20% more spirit and deals 20% increased damage.	Tormented Ruins in Fractured Peaks.
Aspect of the Calm Breeze	Lucky Hit: Wind Shear has up to a 5% chance to replenish your spirit fully.	Grinning Labyrinth in Dry Steppes.

Utility

Aspect Name	Description	Dungeon To Unlock Aspect From
Ballistic Aspect	When you have Fortify, your Earth skills gain +2 Ranks.	Whispering Pines in Scosglen.
Stormshifter’s Aspect	While Hurricane is active, gain +2 Ranks to your Shapeshifting Skills.	Crusader’s Cathedral in Kehjistan.
Aspect of Quicksand	Damage from Earth Skills slows down enemies hit by 25% for 5 seconds.	Ferals’ Den in Scosglen.

Codex Aspects For Necromancer

The Codex of Power for Necromancer in Diablo 4 does not rely on defensive and mobility aspects.

Offensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Empowering Reaper	Critical Strike from Sever has a 10% chance to spawn a pool of Blight under the target that inflicts 20% bonus damage. This can only happen once every 3 seconds.	Flooded Depths in Scosglen.
Blood-bathed Aspect	After a short delay, Blood Surge’s nova echoes again, dealing 70% reduced damage.	Hoarfrost Demise in Fractured Peaks.
Aspect of Plunging Darkness	Bone Prison summons a pool of Blight that deals 50% increased damage over 6 seconds.	Rimescar Cavern in Fractured Peaks.
Unyielding Commander’s Aspect	While Army of the Dead is active, your minions gain 70% attack speed and take 90% reduced damage.	Faceless Shrine in Hawezar.
Aspect of the Damned	Deal 30% increased Shadow damage to enemies infected by Decrepify and Iron Maiden.	Uldur’s Cave in Kehjistan.
Aspect of Swelling Curse	Blood Lance deals 15% increased damage to its primary target per lanced enemy.	Hive in Scosglen.
Aspect of Reanimation	Your skeletons gain increased damage while alive, up to 20% after 10 seconds.	Aldurwood in Scosglen.
Sacrificial Aspect	Sacrifice bonuses are increased by 15%.	Ruins of Eridu in Hawezar.
Aspect of Grasping Veins	Gain a 10% increased Critical Strike Chance for 6 seconds when you use Corpse Tendrils. You also inflict a 30% bonus Critical Strike Damage to enemies damaged by this skill.	Corrupted Grotto in Kehjistan.
Blood Seeker’s Aspect	Blood Lance deals 15% increased damage to its primary target per lanced enemy.	Mercy’s Reach in Fractured Peaks.
Blighted Aspect	Land 50% increased damage for 6 seconds after the Shadowblight key passive hits enemies 10 times.	Akkhan’s Grasp in Hawezar.
Splintering Aspect	Bone Spear’s primary attack makes enemies hit beyond the first vulnerable for 1.5 seconds. The bone shards from this skill deal 50% bonus damage to vulnerable enemies and pierce through them.	Guulrahn Slums in Dry Steppes.
Aspect of Bursting Bones	When a segment of Bone Prison is destroyed or expires, it deals 5 damage in the surrounding area enemies.	Path of the Blind in Dry Steppes.

Resource

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Torment	Critical Strikes with Bone skills increase your essence regeneration by 20% for 4 seconds.	Black Asylum in Fractured Peaks.
Aspect of Potent Blood	When at complete life, Blood Orbs give you 10 essence.	Betrayer’s Row in Dry Steppes.
Flesh-Rending Aspect	After Decompose spawns a corpse, you gain 10 essences.	Nostrava Deepwood in Fractured Peaks.
Requiem Aspect	Gain 3 maximum essence per active minion.	Vault of the Forsaken in Scosglen.
Hulking Aspect	Your Golem has a 1% chance to decrease its active cooldown by 2 seconds and a 1% chance to spawn a corpse each time it hits an enemy with its basic attack.	Sepulcher of The Forsworn in Kehjistan.
Fastblood Aspect	Blood Orbs reduces your ultimate skill cooldown by 0.5 seconds.	Iron Hold in Hawezar.

Utility

Aspect Name	Description	Dungeon To Unlock Aspect From
Torturous Aspect	Enemies inflicted by Iron Maiden have a 15% chance of being stunned for 1 second when they deal direct damage.	Deserted Underpass in Kehjistan.

Codex Aspects For Barbarian

Defensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Bul-Kathos	Leap creates an Earthquake that deals 94 Physical Damage over 4 seconds. While standing in Earthquakes, you gain a 5% increased damage reduction.	Light’s Refuge in Hawezar.
Aspect of Numbing Wrath	Each point of Fury generated while at maximum Fury grants 1 Fortify.	Heathen’s Keep in Hawezar.
Aspect of Tempering Blows	After swapping weapons 6 times, gain 26 Fortify.	Defiled Catacomb in Fractured. Peaks.
Iron Blood Aspect	Gain a 2% damage reduction for each nearby bleeding enemy, up to 10% maximum.	Forgotten Ruins in Kehjistan.
Aspect of the Iron Warrior	Iron Skin grants unstoppable and 10% damage reduction.	Carrion Fields in Dry Steppes

Offensive

Aspect Name	Description	Dungeon To Unlock Aspect From
Earthstriker’s Aspect	After swapping weapons 10 times, your next attack will Overpower and deal 30% increased Overpower damage.	Maugan’s Works in Hawezar.
Aspect of Ancestral Echoes	Lucky Hit: While Call of the Ancients is on your action bar, damaging enemies with Leap, Upheaval, or Whirlwind have up to a 40% chance to summon an Ancient to perform the same skill.	Ancient Reservoir in Hawezar.
Aspect of Berserk Ripping	Whenever you deal direct damage while berserking, inflict 20% of the base damage dealt as additional bleed damage over 5 seconds.	Mournfield in Dry Steppes.
Aspect of Ancestral Force	Hammer of the Ancients quakes outwards, dealing 32% of its damage to enemies.	Sunken Ruins in Scosglen.
Death Wish Aspect	Gain 120 thorns while berserking.	Penitent Cairns in Scosglen.
Aspect of the Dire Whirlwind	Whirlwind’s critical strike chance is increased by 3% each second it’s channeled, up to 9%.	Garan Hold in Scosglen.
Veteran Brawler’s Aspect	Each time a Core skill directly damages an enemy, your next Charge or Leap deals 15% increased damage, up to 225%.	Heretics Asylum in Kehjistan.
Brawler’s Aspect	Enemies damaged by Kick or Charge will explode if killed within the next 2 seconds, dealing 240 damage to surrounding enemies.	Haunted Refuge in Hawezar.

Resource

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Unrelenting Fury	Killing an enemy with a Core skill refunds 10% of its base Fury cost. It can only happen once per skill cast.	Hallowed Ossuary in Fractured Peaks.
Slaking Aspect	Lucky Hit: You have up to a 30% chance to gain 20 Fury when Rend deals direct damage to at least one bleeding enemy.	Maulwood in Fractured Peaks.
Aspect of the Relentless Armsmaster	Gain 20% increased Fury generation while all damage bonuses from the Walking Arsenal key passive are active.	Calibel’s Mine in Scosglen.
Aspect of Echoing Fury	Your Shout skills generate 2 Fury per second while active	Sirocco Caverns in Kehjistan.

Utility

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Anemia	Lucky Hit: Direct damage against bleeding enemies has up to a 20% chance to stun them for 2 seconds.	Kor Dragan Barracks in Fractured Peaks.
Relentless Berserker’s Aspect	Lucky Hit: Damaging an enemy with a Core skill has up to a 22% chance to extend the duration of berserking by 1 second. The duration doubles if you land a critical strike.	Hakan’s Refuge in Kehjistan.

Mobility

Aspect Name	Description	Dungeon To Unlock Aspect From
Aspect of Perpetual Stomping	Damaging an enemy with Kick or Ground Stomp resets Leaps’s cooldown.	Charnel House in Dry Steppes.

My Verdict

Codex of Power in Diablo 4 gives a significant buff to any build, making it customizable according to your own playstyle. I suggest opting for the Aspect of Might, which makes the character more durable by reducing damage after casting a spell, or the Edgemaster’s Aspect, which boosts your damage and can be equipped on any class. 

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