Berserker

A berserker was a warrior who fought in a frenzied manner. In the Realms, the term often referred specifically to
 * Beserker (Rashemi), the famous male warriors of Rashemen.

It could also refer to a specific type of character in various editions of the Dungeons & Dragons rules:
 * Beserker (kit), a kit in 2nd edition or
 * Beserker (nonplayer character), a generic nonplayer character in 5th edition.