Dexion Evicus

Dexion Evicus is a character in. He is a Moth Priest of the White Gold Tower, but unlike other Moth Priests, he has not become blind by reading the Elder Scrolls. He is captured by Malkus and held in a magical cage inside Forebears' Holdout. He carries the unique weapon called the Akaviri Sword. This sword is only obtainable through his death, or the misdirection perk. Death may not be an option. After Dexion has read the Elder Scroll in Castle Volkihar, he will become blind, the Dragonborn may choose to kill him or let him live.

Prophet
The Dragonborn frees Dexion by using a Weystone Focus to lower the magical barrier.

Dawnguard questline
Dexion, whose mind has been indoctrinated by Malkus, immediately attacks the Dragonborn and Serana. After he is defeated, he'll become himself again.

Vampire Lord questline
Dexion must be made a thrall by the Dragonborn using the Vampire's Seduction power and then the Dragonborn must feed on him to make him a thrall. After the quest is completed, he can be found at Castle Volkihar.

Quests

 * Prophet

Trivia

 * Dexion Evicus is the first Moth Priest in the Elder Scroll series to not have a blindfold this is seen however until after the quest Seeking Disclosure begins where he would go blind for reading the Elder Scroll

Bugs

 * Sometimes he may be hostile and not let you continue. A temporary fix for this problem is to use your Vampire's Seduction power on him. This will allow you to talk to him without being interrupted by the attacking NPC vampires. Afterward, the NPCs will resume defeating him. Or if you're not a vampire, and are an Imperial you can use your voice of the emporer to calm him for a short period of time. After it wears off just step out and wait 24 hours and do it again.
 * One possible solution is to make sure Serana does not follow you into Forebears' Holdout. Even if she did accompany you at the beginning of the mission all the way to Dragon Bridge, as long as she does not go with you into Forebears' Holdout, Dexion should no longer be hostile once outside.
 * He can occasionally be seen in the center of the Dawnguard fortress doing the animation for reading an Elder Scroll after the quest Seeking Disclosure has been completed, despite being blind and not actually having an Elder Scroll in his hands.