C-800

C-800 is an Act 3 House Boss that can appear after clearing The Future for the first time, a robotic infiltrator directly referencing the Terminator franchise. This boss invades your home and must be fought by your retired cats, continuing the house boss tradition of testing your home-defense team's readiness. The fight is built around a unique armor-stripping mechanic that gradually reveals the machine underneath the organic exterior.

C-800 starts the fight with a staggering 50 stacks of Brace, which decreases by 1 for each tick of damage it takes. As the Brace depletes, the boss becomes more visibly robotic, its organic disguise deteriorating to reveal the machine underneath. C-800 attacks using explosive hand grenades and various firearms, switching to a random firearm each turn and firing it at the start of the next. This means you can see which weapon it equipped and position your cats accordingly before it fires, but the random weapon selection keeps you guessing about the specific attack pattern.

The 50 Brace stacks mean that the early fight is about sustained chip damage to wear down the armor rather than burst damage, which will be absorbed almost entirely. Multi-hit attacks, DoT effects, and abilities that deal many small instances of damage are far more effective than single large hits against the Brace mechanic. Spread your team to avoid grenade splash damage and reposition each turn based on the weapon C-800 equips. Once the Brace is fully depleted, the fight becomes a more conventional damage race. Defeating C-800 triggers the C-1000 house boss encounter, which is even more dangerous.