This role is played by the moderator: in mod-host and in-person games the mod messages the player in private chat and resolves the ability by hand. Automated nights do not prompt for it.
Each night the mod will give you a condition a word phrase or action to do. If you do not meet your condition then you do not wake up at night. If you are the only wolf then there will be no kill.
Wins when
Wins with the wolves once they outnumber the village.
What you'll see at night
No night prompts. The moderator runs this role in private chat.
Variants
Conditional Wolf
Each night the mod gives you a condition (a word, phrase, or action). Fail it and you don't wake to hunt; if you're the only wolf, there's no kill.
Mod-run via private chat. Prompts and messages are generated by the same night engine the game runs, so they match what players see.