Sett

Sett is a reconstituted demon, summoned by Incognito using Integra's blood. It's never explicitly stated, but it's implied that he's the Egyptian god Set. Though referred to as a Demon in the dub, in the Japanese version Integra refers to it as "Jashin Seto", or "The Wicked God Sett", implying this heavily; and Incognito later says he wields the power of an Ancient God as well, referring to Sett.

Sett appears as a streak of white light, moving through London and destroying eveyrthing in its path; and was absorbed into Incognito's body as part of his ritual. Incognito used its power to fight Alucard in his Level 1 form, but it proved not to be enough and Incognito was killed. Sett's fate after that is unknown.