Abilsin

"How very peculiar to see a detective who is afraid of the truth."

- Abilsin, taunting Adrien

Abilsin (Vessel)
Abilsin, name and design based on the Premortal of the same name (who was also his creator) was one of the Premortal threats, in the form of a single vessel.

He serves as the primary antagonist for the game.

In-Game
Abilsin is mentioned by both Kegan Bowman and Carter Alvarez as being in a position of power beyond the Council - a "puppet master", of sorts. After losing his two puppets, he sends his servant Iago to deal with the matter.

Abilsin is later encountered in the throne room after Locke's kidnapping, where he's seen ordering Iago to kill Locke. Iago refuses the order, instead fighting Abilsin to buy Adrien time to rescue Locke. Abilsin wins the fight effortlessly, however, leaving Iago to wander in a muddled state due to Abilsin's mind-altering powers.

Eventually, Maelstrom goes to confront him within his hidden arctic cathedral in Candlelight Tor. He is defeated, and as he's revealed to be nothing more than a vessel, he reverts to an idle state due to his creators' failure to prepare him for such an outcome.

After Mollaig is defeated and the cathedral starts to collapse, Adrien is trapped under a pillar that Locke is unable to lift, with all of the other Hunters having already exited the cathedral. Adrien tells Locke to leave him behind, but Locke refuses without hesitation. Just when it seems that both Hunters are going to die together as the cathedral collapses, Abilsin lifts the pillar and frees Adrien, saving his life. Adrien asks why he chose to do this, but there's no time for Abilsin to answer, so the two flee the cathedral. Abilsin stays behind and dies in the collapse, taking his reasons for doing so (as well as his reasons for saving Adrien) to the grave.