Description
The first Precision source on a unit flips the unlock that lets ability damage roll critical hits; every additional Precision source after that grants +10% Critical Strike Damage. Sources include Infinity Edge, Jeweled Gauntlet, the Executioner trait, and a few crit-focused augments — layering them stacks Critical Strike Damage.
What enables Precision (9)
Champions (1)
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Rending Claws Leap to the lowest Health enemy within 3 Hexes and deal 500 / 1050 / 2250 physical damage. The next 2 attacks gain 175% Attack Speed and deal 60 / 90 / 135 bonus physical damage. Grey Buff: Gain Precision and 25% Critical Strike Chance, increased up to 75% based on missing Health.
Traits (1)
Completed items (2)
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- +35% AD
- +35% Crit
Gain Precision. Precision: Ability damage can critically strike. Extra Precision grants 10% Critical Strike Damage.
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- +35% AP
- +35% Crit
Gain Precision. Precision: Ability damage can critically strike. Extra Precision grants 10% Critical Strike Damage.
Radiant items (2)
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- +75% AP
- +75% Crit
Gain Precision. Precision: Ability damage can critically strike. Extra Precision grants 10% Critical Strike Damage.
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- +75% AD
- +75% Crit
Gain Precision. Precision: Ability damage can critically strike. Extra Precision grants 10% Critical Strike Damage.
Augments (3)
Prismatic (2)
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Jeweled Lotus II Prismatic Your team gains 25% Critical Strike Chance, 10% Critical Strike Damage, and Precision. Precision: Ability damage can critically strike. Additional Precision grants 10% Critical Strike Damage.
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Retribution Prismatic Gain 2 Hands of Justice. Allies equipped with Hand of Justice gain Precision and 25% Critical Strike Chance. Precision: Ability damage can critically strike. Additional Precision grants 10% Critical Strike Damage.
Gold (1)
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Jeweled Lotus I Gold Your team gains 10% Critical Strike Chance and Precision. Precision: Ability damage can critically strike. Additional Precision grants 10% Critical Strike Damage.
What scales with Precision (7)
Champions (1)
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Triggerseed Passive: Shields from this Ability can critically strike with Precision. Active: Grant 2 / 2 / 10 allies 165 / 300 / 3000 Shield and 10 / 15 / 100% Damage Amp for 6 seconds. Then deal 140 / 210 / 2000 magic damage to enemies adjacent to them. After casting 6 times, also grant 100% stacking Attack Speed to targets.
Traits (1)
Completed items (2)
-
- +35% AD
- +35% Crit
Gain Precision. Precision: Ability damage can critically strike. Extra Precision grants 10% Critical Strike Damage.
-
- +35% AP
- +35% Crit
Gain Precision. Precision: Ability damage can critically strike. Extra Precision grants 10% Critical Strike Damage.
Radiant items (1)
-
- +75% AP
- +75% Crit
Gain Precision. Precision: Ability damage can critically strike. Extra Precision grants 10% Critical Strike Damage.
Augments (2)
Prismatic (2)
- Jeweled Lotus II Prismatic
Your team gains 25% Critical Strike Chance, 10% Critical Strike Damage, and Precision. Precision: Ability damage can critically strike. Additional Precision grants 10% Critical Strike Damage.
- Retribution Prismatic
Gain 2 Hands of Justice. Allies equipped with Hand of Justice gain Precision and 25% Critical Strike Chance. Precision: Ability damage can critically strike. Additional Precision grants 10% Critical Strike Damage.
See also
Frequently asked questions
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What is Precision in TFT?
Precision is a keyword on items, traits, and augments. The keyword is defined in one sentence: 'Precision: Ability damage can critically strike. Additional Precision grants 10% Damage Amp (this can stack with multiple sources of Precision).' The first half is the long-standing rule — by default ability damage cannot crit, and a Precision source flips that switch for the unit holding it. The second half is the stacking reward: every additional Precision source after the first hands the unit +10% Damage Amp.
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Doesn't additional Precision give Crit Damage when stacked?
No — additional Precision grants Damage Amp, not Crit Damage. Older guides (and some in-client tooltips that lag behind the data files) still read 'Additional Precision grants 10% Critical Strike Damage,' which would mean doubling up on Precision items only buffed crits. The live keyword reads 'Additional Precision grants 10% Damage Amp,' which is a different stat entirely — Damage Amp applies post-mitigation to all damage the unit deals, not just to critical strikes. The unlock half of the keyword (first source lets abilities crit) is unchanged; only the stacking reward differs. Where a tooltip and the patch notes disagree, the patch notes are the authority.
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Does Damage Amp from stacked Precision apply to basic attacks, or only to abilities?
It applies to everything the unit deals damage with. Damage Amp in TFT is defined as 'the amplification of the damage that the champion inflicts post-mitigation' — it sits on the final hit, not on a specific damage source. So +10% Damage Amp from a second Precision source raises basic-attack, ability, and on-hit damage by the same proportion. That makes layered Precision on a basic-attack carry like an attack marksman just as useful as on an ability-based caster — a Crit Damage bonus, by contrast, would only have paid off when the unit was actually critting.
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Do multiple Precision sources stack additively or multiplicatively?
The patch notes confirm they stack — 'this can stack with multiple sources of Precision' — but do not specify the math. Damage Amp in TFT is commonly understood to combine additively across sources (Riot does not specify the math), so three Precision sources on the same unit would read as +20% Damage Amp on top of the first source's ability-crit unlock, and that 20% would multiply post-mitigation damage. That's the most consistent reading of how Damage Amp is described elsewhere, but the patch notes themselves are silent on per-source multiplicativeness, so the in-fight unit tooltip — which shows the running Damage Amp total — is the cleanest verification on a live board.
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If a trait already gives my unit Precision, is stacking Precision items still worth it?
Yes — and arguably more so than before. The team-wide or trait-innate Precision source claims the binary 'abilities can crit' unlock once per unit, and every additional Precision source on top of that is +10% Damage Amp. Damage Amp scales the unit's entire damage profile rather than just its crits, so a carry that already has Precision from a trait innate treats Precision items as a flat damage stacker. The Crit Chance and AP/AD stats those items also carry are independent of the keyword, so they still scale the rest of the unit normally.
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If I stack Crit Chance on an ability carry without any Precision source, does my Crit Chance still do anything?
It still applies to that unit's basic attacks between casts, but it does not affect ability damage. The TFT wiki rule still holds — 'most abilities are unable to critically strike on their own' — and it is exactly what the first half of the Precision keyword unlocks. Without a Precision source on the unit, ability damage ignores Crit Chance and Crit Damage entirely no matter how high they go. For an ability-heavy carry that means raw crit stats are mostly wasted until you slot in at least one Precision source.
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Does Precision change the damage type of an ability, or how the spell calculates its base damage?
No. The unlock half of Precision only changes whether an ability hit is allowed to roll a critical strike; it doesn't touch the damage type, the scaling source, or how base damage is computed. A magic-damage ability with Precision still deals magic damage and still scales from Ability Power; it just lands as a critical strike when the Crit Chance roll succeeds. The stacking half — Damage Amp — is also damage-type-agnostic on the unit's side, although note that Damage Amp itself does not boost true damage in TFT, so a true-damage ability's flat portion stays flat regardless of how much Precision is layered.
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How does Precision interact with the rule that Crit Chance above 100% converts into Crit Damage?
It compounds cleanly. The conversion rule itself is on the Crit Chance side: 'critical strike chance cannot be increased beyond 100% but increases critical damage to an amount equivalent to the excess.' Precision doesn't change that conversion — its first source decides whether the resulting Crit Chance and Crit Damage values get to apply to abilities at all. So a Precision-active unit at 120% raw Crit Chance ends up at the 100% cap with the extra 20% folded into Crit Damage, and that Crit Damage figure now multiplies ability hits as well as basic attacks. Additional Precision sources are independent of this — they add Damage Amp post-mitigation, on top of the crit math.