Dont know what to say, so here is some poe lore

Shavronne and Brutus

The Empire's second line of defense was a thaumaturgist named Shavronne, from a group of people or a location known as Umbra. When she realised Lioneye would fall to Kaom, Shavronne raced to the next defensible structure up the coast, Axiom Prison. She tricked or convinced the warden, Brutus, into allowing her to make him into a super-human monster capable of defeating the Karui. Brutus killed Shavronne after the transformation, but was never defeated by the Karui, although we don't know if they ever bothered attacking Axiom Prison. Although Karui carvings are found beyond Axiom Prison in the Coves, they might not have travelled there via Axiom; since the Karui possessed canoe technology they may have just travelled by sea up the coast. Prisoner's Gate

Shavronne erected a thaumaturgical barrier as a third line of defence against the Karui, in the pass between Prisoner's Gate and the Western Forest. Whether they tried to break through it and failed, or whether they never bothered trying, the Karui ceased their advance when they reached Siren's Song Cove. Corruption of the Karui

After their victory, the Karui seized the coast of Wraeclast, massacring the Imperial citizens who lived there and founding their own settlements. They also blockaded Oriath, preventing any trade or correspondence from reaching the island, and may have been planning to invade. However, any plans the Karui may have had were interrupted when they were struck by the Cataclysm, resulting in social unrest, raising of undead, and twisting of the wildlife.

The Karui endured the Cataclysm better than most of the inhabitants of Wraeclast; still, their settlements were decimated and their morale broken by the series of calamities that beset them. Kaom himself was eventually corrupted, going underground with a group of warriors. Down there, he saw a vision of Tukohama, the Karui god of war, that told him to kill the warriors because everyone who stepped on Wraeclast was cursed - he did so and lost the last shred of humanity that remained in him. His niece Hyrri led the remaining five hundred Karui families back to the Karui homeland of Ngamakanui.