Kibris

The Kibris or Kibris Berserkers are an alien species that exist in the 42nd Millennium.

Biology
A savage humanoid species with physical canid traits. Their heads are long, bestial snouts and swept-back ear, with canines that are so large and sharp that they can tear through flak armour.

Culture
Nothing is known about the kibris intellect of culture other than that they are savage combatants. Their savagery in battle, is speculated to be the result of members of the species in consuming some kind of intoxicant before a battle. Through this they can enter a berserker state, making them impossible to kill, as the state allows them to ignore any wounds until the stimulant wears off which will ultimately cause the death of the berserker.

During the 42nd Millennium, the kibris came in conflict with the Tau over the planet Cyrenica which they lost to the latter. Some kibris stranglers attempted to assassinate members of the Ethereal Caste, but were foiled thanks to the sacrifices of the members of the Fire Caste that placed themselves between their esteemed leaders and the kibris.

Source

 * Liber Xenologis (2021)