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This article explains the mechanics of buffs (i.e. positive effects) in Arknights.

Attributes

There are three types of attribute buffs: direct, ratio, and multiplier.

Direct

Direct buffs increase the corresponding attribute by a fixed value which stacks additively with each other, which can be distinguished by the skill/talent description that states "{attribute} +{value}."

While working in a similar principle, Inspiration effects are not considered as direct buffs.

Ratio

Ratio buffs increase the corresponding attribute by a set percentage of the original value which stacks additively with each other, which can be distinguished by the skill/talent description that states "{attribute} +{percentage}%."

Vigor

Multiplier

Multipliers increase the value of the corresponding attribute (that is, after all direct and ratio buff(s) are applied) by a set percentage which, as its name suggests, stacks multiplicatively with each other, calculated by the following formula:

Where:

  • a represents the final multiplier.
  • x represents the value of each multiplier.
  • n represents the multiplier's count (1st, 2nd, etc.).

Multipliers can be distinguished by the skill/talent description which states "Increase {attribute} to {amount}%" or "Increase {attribute} by {amount}% of {attribute}." Note that only effects with a duration are counted as multipliers (and changes the stats in the info panel.) Effects without a duration is counted as an Amplifier (see below)

Please notice that Inspiration is not multiplied by a Ratio buff, but by a Multiplier buff instead.

Some effects, usually the ones that decrease DEF, are a Multiplier instead of a Ratio buff, contrary to its "-" symbol. For instance, SilverAsh's Truesilver Slash reduces his DEF by 70%; the DEF reduction is a Multiplier, which basically means that any increments to his DEF will be accordingly reduced.

Amplifier

Amplifiers increase the value of an ATK/Damage/Healing. It does NOT change the basic stats. Amplifiers stack multiplicatively.

Since Amplifiers does not change the basic stats, the Tytus Topola will ignore any Amplifiers when choosing the target to decrease ATK.

Damage reduction

Damage reductions, as its name suggests, decreases the corresponding type of damage taken by a set percentage which stacks multiplicatively with each other, calculated by the following formula:

Where:

  • a represents the final damage reduction.
  • x represents the value of each damage reduction.
  • n represents the damage reduction count (1st, 2nd, etc.).

The following are sources of damage reductions. Unless noted otherwise, the reduction applies to all three types of damage (Physical, Arts, and Pure).

Operator Source Range/Target Value
Bena's Protractor (talent) Bena's substitute 20%/40% Physical and Arts
Waves of Ægir (talent) Abyssal Hunters Operators (including Gladiia herself) 15%/25% Physical and Arts from Sea Monsters
Brotherhood (talent) Self 30% from Sarkaz enemies

Sanctuary

Other buffs

Buff Effect
Camouflage (Friendlies only) Cannot be attacked/targeted by enemies when not blocking them.
Invisible Cannot be attacked/targeted and unaffected by splash damage when not being blocked (enemies) or are blocking an enemy (friendlies).
Shield (Friendlies only) Negates one instance of damage.
Status Resistance Halves the duration of Abnormal Statuses.
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