Berserkers are a type of fury. They are subject to internal change when connecting with the æther, typically to the dreamscape. When they use their clairvoyance, they enter a blind rage that can be potentially harmful in the long term.
Jaxon Hall first came across this ability while reading a translated document on the ancient warriors of the same name, the Viking Berserker. These berserkers become consumed by wrath during battles, resulting in a battle-trance that transforms them so tremendously that they can fight with a rage that is almost animal in nature. Jaxon proposes that these fits would not be caused by excessive rage or by any enchantment, but by a deluge of spirits in the vicinity of the clairvoyant.