Berserker yoma

Berserker Yoma are created when a yoma ingests or has vanguard tears poured onto a wound. The transformation from a yoma to a berserker is almost immediate.

Berserkers are as tall as a two story building and heavily muscled. They seem to be mindless but can take orders better than a feeder. They are particularly good as battering rams, smashing though conventional barriers easily as noted by Brook. Berserkers may possibly lack the ability to extend their fingers as spears, a trait common to regular yoma. When a berserker is killed, it's body shrinks back to normal size, drained of all yoki, leaving only a dry yoma-sized bag of bones.

Brook creates the first berserker in Purge. Later a berserker was found in the north and was quickly killed by Noble.