Mastema

Mastema is a major antagonist in the Siren series and the archenemy of Angela, although he is one of the Alpha's archangels in service of the High Heavens he is actually a pawn of Evil - becoming more and more corrupt as Evil manipulates him into staging a Second War in Heaven: although Evil knows Mastema would fail against the Alpha's might she has infused Mastema with extreme delusion and hate, convincing him that he can overthrow the Alpha and rule over a draconion version of "Heaven" shaped by his own cruelty and arbitary "law".