← Boss Cheat Sheet

Donu & Deca

Act 3 β€” The Beyond Β· HP: 300 / 300

Extreme
⚠️Kill Deca first! Letting it keep stacking shields on Donu makes the fight infinite.
Key Mechanics
  • β€’Two bosses fight simultaneously β€” must kill both or focus one.
  • β€’Deca continuously shields Donu; Donu hits hard.
  • β€’Their turns coordinate β€” watch both patterns simultaneously.
Strategy

Focus Deca (the caster) first to stop the endless shields on Donu. AoE cards are extremely valuable here. Burst builds can try to two-shot both simultaneously.

Moves
Circle of PowerDeca: applies large Block and buffs to Donu.
Square of ProtectionDonu: applies large Block to itself.
Beam(10 dmg)Single-target hit for 10 damage.
Donu & Deca Boss Guide β€” Slay the Spire 2 | STS2 Guide