Keksis

Keksis, The Betrayed is a Taken Captain encountered in the Prison of Elders.

Gameplay
Keksis is encountered in the level 41 Prison of Elders and The Challenge of the Elders. He is equipped with an Arc Shrapnel Launcher, can teleport, and throw darkness bolts that momentarily blind Guardians.

In Challenge of the Elders, he is able to summon explosives that can suppress a Guardian's abilities. The explosive floats in the middle of the arena and the Guardians must stand in it and channel its corrupted light to avoid the debuff.

Trivia

 * Despite being a Captain, his headdress more closely resembles that of an Archon.