Power potential

Every item card prints one, and the card describes it as the item's potential power; derived from its Item Level, Rarity, and the Modifiers it has. No item ships the number: the game adds it up on the card out of ten terms, from the item's level, the slot it fills, how far it can be tempered, and the slots its rarity hands it.

The hero panel prints a second number called Power Score, over a whole loadout. That is a different scoring rule with its own reading of the same settings, and it is not the sum of the number below, so a card's Power Potential is not that item's contribution to a hero's Score.

The terms10 terms

Term	Adds	Counted	Applies to
Item level	14	Per item level	Every slot, scaled by the slot's stat weight
Tempering ceiling	20	Per temper allowed	Every slot, from the rung and the item level
Rerollable slots	20	Per rerollable slot	Every slot, from the rung's additions
Gem socket	40	Once	Any slot whose rung hands it a socket
Weapon ability	80	Once	A Weapon carrying a granted ability
Relic ability	80	Once	A Relic carrying a granted ability
Weapon trait tree	120	Once	A Weapon carrying a trait tree
Neck trait tree	120	Once	A Neck carrying a trait tree
Set bonus	20	Once	Any slot whose rung hands it a set bonus
Legendary	1000	Once	Any slot at the legendary rung

Every term adds. Nothing in the sum multiplies, divides, floors or clamps, and the slot weight scales the item level term alone. The card rounds the total to a whole number to print it, and that is the only rounding there is.

Slot weights12 slots

The item level term is the only one a slot changes. Its weight is the slot's share of a hero's stat budget, the same number the stat lines are cut from, and the twelve of them sum to 0.88 rather than to one. Nothing in the total divides by that sum.

Slot	Stat weight	At item level 360
Weapon	0.11	554.4
Chest	0.1	504
Legs	0.09	453.6
Head	0.08	403.2
Shoulders	0.08	403.2
Feet	0.07	352.8
Neck	0.07	352.8
Hands	0.06	302.4
Relic	0.06	302.4
Ring	0.06	302.4
Back	0.05	252
Wrists	0.05	252

Worked examples7 cards

Every card below is one the game drew, summed here by the same code the codex prints its own tooltips with.

Asha's Chronoshift Spire Weapon · Epic · item level 315

Item level	315 × 14 × 0.11	485.1
Tempering ceiling	6 × 20	120
Rerollable slots	1 × 20	20
Weapon ability	flat	80
Weapon trait tree	flat	120
Power Potential	825.1 rounded	825

Webbed Gloves Hands · Regal · item level 315

Item level	315 × 14 × 0.06	264.6
Tempering ceiling	8 × 20	160
Rerollable slots	3 × 20	60
Power Potential	484.6 rounded	485

Two of these, tempered 4 / 8 and 6 / 8, both read the same total. The term takes the ceiling the rung allows, not the tempers already spent.

Grimoire of Resurrection Relic · Epic · item level 315

Item level	315 × 14 × 0.06	264.6
Tempering ceiling	6 × 20	120
Rerollable slots	1 × 20	20
Relic ability	flat	80
Power Potential	484.6 rounded	485

Ancient Poultry Fetish Relic · Regal · item level 315

Item level	315 × 14 × 0.06	264.6
Tempering ceiling	8 × 20	160
Rerollable slots	2 × 20	40
Relic ability	flat	80
Power Potential	544.6 rounded	545

Its Imbued Essence is a gem power rolled into a modifier slot, not a gem socket, so no socket term lands.

Pendant of the Deep Neck · Heroic · item level 255

Item level	255 × 14 × 0.07	249.9
Tempering ceiling	4 × 20	80
Rerollable slots	1 × 20	20
Neck trait tree	flat	120
Power Potential	469.9 rounded	470

Its trait tree is unallocated on the card and still adds the whole amount: the term reads the tree's presence, never how much of it is spent.

Witchslayer's Legs of Determination Legs · Regal · item level 315

Item level	315 × 14 × 0.09	396.9
Tempering ceiling	8 × 20	160
Rerollable slots	2 × 20	40
Set bonus	flat	20
Power Potential	616.9 rounded	617

Masochistic Razor Loop Ring · Legendary · item level 360

Item level	360 × 14 × 0.06	302.4
Tempering ceiling	0 × 20	0
Rerollable slots	0 × 20	0
Gem socket	flat	40
Legendary	flat	1000
Power Potential	1342.4 rounded	1342

It carries a granted ability and three legendary stats and scores for neither. A ring is not a weapon or a relic, and not a weapon or a neck.