One of the player is selected as Secret Jester. He retains his role, but his wincon is changed to jester's one (and he gains chatterbox too).
Everyone will instantly lose when Secret Jester is hanged.
However, if the Secret Jester is killed, then faction which did that - wins the game. All other wincons, except for Town one, is absent.
If the SJ is the evil that must be killed in order to win the game - he loses if he is the last evil that needs to be lynched.
SJ cannot be a leaving role, and this modifier auto-bans Jester.