Lich

You may reveal your role at any time. While your role is revealed you cannot lose the game and your opponents cannot win. Whenever you would take damage that would set your life to 0 or below, instead sacrifice a permanent or discard a card. If you cannot do either you lose your role.
Win: You win by killing all other players.
Is humanity really that worth hanging on to, if you lose it along with everything else in the ine