Poop
None can or shall avoid me as I'm a must.
Passive - Poop is Universal : Poop is unavoidable hence you can't be lynched, killed, removed, or anything like that.
Passive - Poop is Nature : Nature runs its own course hence you can't be crushed, blocked, jailed, commuted, or anything like that.
Passive - Poop is Infinite : All creatures are bound to poop infinitely until they die hence each phase you can spam one of your abilities.
Active - It's Coming : Each night mark a player and let them know they are about to poop.
Active - Strong Diarrhea : Each night you can give a marked player strong diarrhea and make them die at the end of the following day.
Active - Constipation : Each day you can give a marked player constipation and make them die after a cycle.
Win-Condition : Survive and kill everyone you want.