Krexler is the last remaining member of an ancient alien race, The Nyx. Krexler is the main antagonist of the series, hiding within plain sight as he and his race have left several breadcrumbs of alien technology scattered around the base, leading them to discover his hidden remains later on in the series which lead to the downfall of order within the base.

Krexler's lines should be spoken very slowly and calmly, as though he is calculating every word, he has all the time in the world to manipulate these people and he doesn't care one bit.