Deriahk

Early Life
Deriahk, like other Skakdi, first lived on the island of Zakaz. He left the island at the arrival of Spiriah and began a quest to find Artakha, believing that he could shelter there away from the destructive might of Spiriah. He never succeeded in finding the Great Refuge, but he arrived at Takiw Nui. There, he met Vavakx and become his assistant.

The Pit
Many years later, Deriahk went to the Razor Whale's Teeth (as Hydreriahk) and met with Vavakx to plan how to get the Kanohi Ignika. He was told by to abduct the Ga-Matoran Kyrehk who picked the Mask of Life during its fall and bring her to his cave.

Later, Deriahk and Vavakx discovered Veuy and Manauhk. After that, Deriahk sacrified part of his own life energy to allow Vavakx to escape and he fell unconscious, but he had freed Vavakx from his prison and in gratitude he teleported Deriahk to safety.

Dark Hunters
Deriahk helped Vavakx for a while in Karda-Nui. Then he escaped in a vehicle and was trapped by the Dark Hunters. As a Dark Hunter, he first met other Skakdi, and took his last mission as a Dark Hunter.

Karda-Nui
Deriahk was told to help Vavakx in the war against the Brotherhood of makuta in Karda-Nui.