Since you put random bosses on random arena places, you have to actually clean up the arenas from things that can block you or damage you or make AOE not visible.
Like logs, stones, fog and other things.
Also remove the acid water in the boss arena after youve ativated the dam.
It damages you for no reason while digging or fighting the bosses.
Specially annoying for low health builds.
When you fight the boss with the boar in the boss arena of the mutated bear,
you cant see the aoe line attack (or bareley see), because of the fog on the ground.