Sinis is one of The Deciever's shades.

During the Great War The Deciever had a clash with The Watcher on one point, possibly during the battle for Tyr, and Sinis was thought to have died when Mazzarin collasped the Shrine of Nyx upon him.

This was proven false as when the Five Companions rescued Alric from The Deciever's captivity in The Barrier and Sinis showed up with an entourage of myrmidons and soulless to deny them escape. After a brief exchanging of words, his force was then destroyed after Alric unleashed several dispersal dreams, Sinis was then killed for good after dueling Alric.