Characters or other entities that (under certain conditions) fight in uncontrollable frenzy, attacking anyone in their way or near them regardless if they're friend or foe.
Name variations: berserks, berzerkers, berzerks, confusion, charm
The first video game about Berserkers was released on December 21, 1998.
Includes also presence of magic, drugs, or other things that can cause anyone to behave this way.
Status effects, magic or such that cause confusion or charm effect usually inflict this on others.