/bər-ˈsərkiŋ/
vi. A MUD term meaning to gain points only by killing other players and mobiles (NPC; non-player characters). Hence, a Berserker-Wizard is a player character that has achieved enough points to become a wizard, but only by killing other characters. Berserking is sometimes frowned upon because of its inherently antisocial nature, but some MUDs have a berserker mode in which a player becomes permanently berserk, can never flee from a fight, cannot use magic, gets no score for treasure, but does get double kill points.
"Berserker wizards can seriously damage your elf!"