An Empowerer is a protective power role that prevents their target from being roleblocked. Empowerers are very useful for both town and scum. Town Empowerers can keep a known Cop from being roleblocked, as Cops are prime targets for Mafia Roleblockers, especially when the Cop is protected by a Doctor. The Mafia can use the role to keep their important night actions, such as nightkills, from failing.
Empowerers are fairly rare in SA games.