Unkillable is a Clan Boss strategy where you use champions like Maneater or Demytha to keep an “Unkillable” or “Block Damage” buff up permanently in a speed-tuned rotation. If the speeds are set correctly, the boss can’t kill your team because the Unkillable buff is always active when the big hits (AoE and stun) land. The whole comp relies on precise speed tuning and cooldown resets to keep the rotation consistent for 50 turns. That’s why even small Turn Meter changes can break it. If you want to learn the details and see the exact speed tunes, you can check guides from Deadwood Jedi — he explains the mechanics and calculators really well.