One of three possible Act 2 Bosses. Spawns up to two minions at a time and has 282 HP.
I'm not one for strat, as I just fumble through the game.
The pattern the boss takes is as follows:
"Always starts with 'Spawn' and always uses the 'Mega Debuff' on turn 4. Can only have a maximum of 2 'Torch Heads' throughout the battle.
If one or more of the 'Torch Heads' are dead, has a 25% chance of using 'Spawn', 45% chance of using 'Fireball' and 30% chance of using 'Buff'.
If both 'Torch Heads' are alive, has a 70% chance of using 'Fireball' and a 30% chance of using 'Buff'.
Cannot use 'Buff' twice in a row and cannot use 'Fireball' three times in a row"
Taken from https://slay-the-spire.fandom.com/wiki/The_Collector