Unique Helmets

Cornathaum

Cornathaum grants 5% increased Experience gain together with Intelligence and item rarity. Its main value is faster character progression rather than a combat-specific mechanic.

0.5.4d

Current data

Catalog version 0.5.4d

No direct 0.5 patch change is linked to this page. The displayed values are current for catalog version 0.5.4d.

Item effects

4 lines

01(10-20)% increased Rarity of Items found

02+(40-50) to Intelligence

0330% increased Light Radius

045% increased Experience gain

Cultivation outcomes

3 possible modifiers

A Vaal Cultivation Orb can replace up to two existing modifiers on a corrupted copy of Cornathaum. The replacement is selected from this item-specific pool; the replaced original lines are not player-selected.

C01(100-150)% increased Armour and Energy Shield

C02(5-10)% increased Quantity of Gold Dropped by Slain Enemies

C03Increases and Reductions to Light Radius also apply to Area of Effect at (25-50)% of their value

Browse all 48 compatible uniques and outcome pools

How to get Cornathaum

World drop

Cornathaum can drop anywhere. It can be chanced.

Drop: Enabled
Restriction: None
Orb of Chance: Eligible

Runeforging input

This item is consumed by 1 exact Runeforging recipe.

Vaal Orb outcomes

4 outcomes / 13 enchantments

Vaal Orb can corrupt Cornathaum. One applicable outcome is selected, and the item normally cannot be modified again by ordinary crafting.

No change.

Applies a modifier magnitude multiplier of 0.78x to 1.22x (in 0.01 increments) before rounding to explicit modifiers. Applies before quality effects.

The resulting values are rounded to the nearest whole number, rather than always being rounded down like most decimal values in the game. However, testing suggests the game may use truncation with a +0.5 shift instead of standard rounding. This appears to bias internally negative stats (like 10% Reduced Dexterity) toward zero, preventing some expected values from appearing while making others more common. A formula of trunc(value + 0.5) may explain this behavior.

Adds a special Vaal enchantment to the item.

Adds an item socket to weapons (including sceptres) and armour, ignoring socket limits.

For jewellery, no change. (This outcome is not removed by Omen of Corruption.)
The item cannot have more sockets than the amount of space the item takes up.
If the item is socketed with Cadigan's Epiphany, the item cannot gain an augment socket via corruption.

Possible corruption enchantments13

(15-25)% increased ArmourLocal / Level 1

(15-25)% increased Energy ShieldLocal / Level 1

(15-25)% increased Armour and Energy ShieldLocal / Level 1

(10-20)% reduced Attribute RequirementsLocal / Level 1

+1 to all Minion Skill GemsGlobal / Level 1

+(20-30) SpiritGlobal / Level 1

+1 to Maximum Power ChargesGlobal / Level 1

(15-25)% increased Life Regeneration RateGlobal / Level 1

(20-30)% increased Mana Regeneration RateGlobal / Level 1

+(50-100) to Accuracy RatingGlobal / Level 1

+(1-3)% to Maximum Fire ResistanceGlobal / Level 1

+(1-3)% to Maximum Cold ResistanceGlobal / Level 1

+(1-3)% to Maximum Lightning ResistanceGlobal / Level 1

View every corruption outcome and enchantment

How it works

1 interactions

Experience gain

5% increased Experience gain.

Related mechanics

MechanicLight Radius

Light Radius controls how far your character illuminates dark areas and how far terrain and points of interest are revealed on the map. It is an exploration and visibility stat, not a direct damage or item-drop multiplier.

Guides using this page

CampaignExperience and leveling guide

Choose content inside the full-experience level range, calculate the exact level multiplier, check XP to the next level, and avoid preventable endgame experience loss.

Item viewModernIn-game