Silencer

Silencer is a role that chooses a player at night. That player is then unable to speak for the following day. Whether they can still vote is unstandardized.

Silencers are basically always scum. There's nothing prohibiting Silencer from being town, but they're arguably negative unility if so.

Use and power

Silencing a player effectively removes from them any hope of participating in the game for a day. This makes them rather unfun to play against, even for players who are normally lurkers. When used in lategame, they can stop a player from claiming their role and/or results, which can be especially infuriating for a town that may otherwise win if the results can be outed.

Town Silencers can shut up scum, but this isn't particularly helpful, as no one will be able to refine reads on them for the day (which is necessary to get them lynched).

Overall, Silencer is crap for town, arguably overpowered for scum, and not fun to play against in either case.