This is a standalone mod that removed all immunities from bosses including modded bosses. The exception to this is poison effects for undead creatures like the Wither in base Minecraft or the Lich in Twilight Forest to name a few. This is to keep it in theme with the undead monster immunities. I made this mod simply to aid other mods as well as pure vanilla+QoL playthroughs that focus on using "magic" or other special effects that apply potion-like effects that cause damage to give you the ability to play more in whatever way you want as I don't beleive bosses should be hard immune to everything the player does.