Originally posted by Nightlistic:

I literally had Bonemass, an Abomination, Wraith, a Deathsquito, and Fulling's all after me in addition to Skeletons, Draugers, and Blobs. There was no way to win that fight with all those enemy spawns so compacted together. Had to do a killall devcommand if I was going to progress my game. Really hope they adjust the abominations or somehow prevent boss fights from spawning surrounded by biomes not meant to be entered before your character has progressed to that area.

I understand your frustration but the fact that you mention wraths tells me that you made a big mistake. You went there at nighttime which I wouldn´t recommend to do.
Wraths only spawn at nighttime and it is then when regular mobs also spawn more frequently. Avoid that the next time. Also clear the area around the arena and place a couple fireplaces in order to block the regular spawns so they don´t come ontop of those the bonemass spawns during the fight. They don´t have to be lit to block the spawns. Dont give up, you can make it.