TFT Set 17.6
Kai'Sa, a 3-cost Dark Star unit in TFT Set 17

Kai'Sa

3 Attack Caster 
Bullet Cluster
Passive: On takedown, gain 10 mana.

Active: Fire 16 missiles in a 2-hex radius around the current target, dealing 33 / 50 / 79 Attack Damage physical damage each.
Mana Per Kill
10
Base Num Missiles
16
Hex Range
2
Damage
30 / 45 / 72% Attack Damage + 3 / 5 / 7% Ability Power

Traits

  • Dark Star
  • Rogue 
    Rogues gain Attack Damage and Ability Power. The first time they fall below 50% health, they slip into shadows. Enemies targeting them are redirected to a nearby unit, preferring Tanks.

Kai'Sa enables

  • On Takedown

    Effect fires when a unit secures a kill or assist. In Set 17, Kai'Sa's passive "On takedown, gain 10 mana" is a clean example, and Seeker's Armguard stacks +20 Armor / MR / AP per takedown.

  • Mana

    The unit-level resource that gates ability casts — champions cast once their mana bar fills, so low-mana units cast more often than high-mana ones. Spear of Shojin (mana per attack) and Adaptive Helm (amplifies Mana from all sources) push casts faster, alongside starting-mana augments. Blue Buff is no longer a mana item in Set 17 — it's now an AD/AP amp.