With Killavolt being a side quest, I think Billy is the toughest and most frustrating “required” boss in the game (he’s harder than any boss that comes after him IMO). Despite the crappy mechanics and such, it appears the FFYL “fodder” is no longer spawning after you die. I can get him down to 25% health and there are no support spawns for FFYL revival - but I can never kill him (died ~10 times as L26 Amara). Perhaps I’m not drawing the fight out long enough, but this is an issue - the theater is completely empty during the whole fight - but the first time I fought him, there were plenty of support mobs. Now, none spawn. So I think it is a bug. I’ll try restarting the game to see if that makes a difference, but respawning isn’t fixing it. Also, he can spawn camp you - so the second you respawn he attacks.
This fight is simply horrible; way too difficult for its place in the game. My L26 Amara is sporting all purples (L24-25) and does fine in all content - and has done all side quests as I progress. I’m sure the fight would be easier if I was 27-28, but Billy is 26 and the fight is just absurd in the damage that he does with every attack. The fight isn’t a challenge at all IMO it’s just a drawn-out experience of dodging and frustration.
CONFIRMED BUG. I restarted the game and the fodder spawn was back in the theater. Needs to be fixed!