>>718803113
They were all supposed to be evil wizards riding serpents originally. Korax is seen in Heretic's ending, looking very similar to D'Sparil. The Korax we see in Hexen was originally the serpent mount that the wizard would've been riding. Someone at Raven a long time ago said they changed it near the end of Hexen's development time, as the bosses were the last things they did.