Hacathai
From Warhammer 40k - Lexicanum
Hacathai is a Sorcerer of the Thousand Sons who acts as a emissary for Magnus the Red.[1]
In M41, Hacathi was sent with a force of Rubric Marines aboard the Scales of Truth from Sortiarius by Magnus in order to aid Azhek Ahriman and the Thousand Sons against the Pyrodomon.[1a] However Hacathi was instead consumed by the affliction along with the rest of the Scales of Truth, and instead set course for the Eye of Terror presumably with the intent to infect the rest of the Planet of the Sorcerers.[1a] Ahriman was able to use the Key of Infinity to reset the timeline, preventing the creation of the Pyrodomon in the present setting.[1b]