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This article is about the Operator class. For the enemy, see Caster (enemy).

Caster is one of the eight Operator classes in Arknights.


Casters attack enemies with their Originium Arts, dealing Arts damage instead of the usual Physical damage. This makes Casters a viable option when facing enemies with high DEF as they typically have little to no RES.

While having good ATK, Casters have high DP cost and their attack interval is quite high, making them not as efficient as Snipers against fast-moving enemies and those with RES. Nevertheless, Casters will prove their worth when used correctly and kept away from ranged enemies due to their rather low HP and DEF.


Branch Trait
Core Caster
Deals Arts damage
Single-target ranged Arts attacker
Splash Caster
Deals AOE Arts damage
Ranged Arts attacker that deals area-of-effect/splash damage
Blast Caster
Deals AOE Arts damage in a long line
Ranged Arts attacker that hits all targets in a linear range
Chain Caster
Attacks deal Arts damage and jump between 3/4 enemies. Each jump deals 15% less damage and inflicts a brief Slow
Single-target ranged Arts attacker whose attack jumps between multiple targets (3 base, 4 Elite 2) with a 15% damage penalty in each jump and Slows them
Mech-Accord Caster
Controls a Drone to deal Arts damage to an enemy; When the Drone continuously attacks the same enemy, its damage will increase (up to 110% of the operator's ATK)
Single-target ranged Arts attacker with a Drone that attacks in tandem with the Mech-Accord which deals low damage that increases on subsequent attacks against one target
Phalanx Caster
Normally does not attack, but has greatly increased DEF and RES; When skill is active, attacks deal AoE Arts damage
Area-of-effect Arts attacker that only attacks during skill activations, dealing Arts damage to all targets in range, and has increased defenses outside of skill activations
Mystic Caster
Attacks deal Arts damage; When unable to find a target, attacks can be stored up and fired all at once (Up to 3 charges)
Powerful single-target ranged Arts attacker that can "build up" attack charges when no enemies are in range to be released on the next attack
Primal Caster
Attacks deal Arts damage, and can inflict Elemental damage
Single-target ranged Arts attacker capable of inflicting Elemental damage on enemies


Operator Subject Interaction
Pyrobreath Increases the ATK of Casters while Eyjafjalla is deployed (present on the squad when her CCR-X Operator Module is upgraded).
  • Elite 1: 7%
  • Elite 2: 14%
  • CCR-X Stage 2: 18%
  • CCR-X Stage 3: 22%
  • Potential 5: +2%
Spell Formation Gives SP to other Casters whenever Lava the Purgatory is deployed and when they are deployed while she is deployed.
  • Elite 1: 2
  • Elite 2: 4
  • Potential 5: +1
Skill Aura - Caster Increases the automatic SP generation rate of Casters while Mostima is deployed (mutually exclusive with other SP generation boosts).
  • Elite 1: 0.2 SP/sec.
  • Elite 2: 0.4 SP/sec.
"All For Me"
Increases the ATK of Casters while active.
  • Level 7: 25%
  • Mastery 3: 40%
Stable Esthesia Increases the ATK of Rosmontis and a random deployed Caster by 8% while she is deployed.