Ignatius' demonic form!!
This form is controlled by him, and he usually transforms when he’s furious, like he's ready for battle or something similar.
Following my lore, there is a specific crystal that only grow within the realms of Creation (basically the Heaven for humans). Those are the ones growing on Ignatius' halo, which is a common phenomena for angels/archangels as well as the yellow dots around him, those are eyes. When he was cast down from heaven, his halo was shattered and embedded in his forehead, like two pairs of horns. Therefore when he transforms into this demonic form, his forehead bleeds due to the crystals growing out. This transformation causes him excruciating pain. (I mentioned before that Iggy's blood is white, yeahh not gonna happen jahahsgshah IT LOOKS WEIRD. Im staying with red for this one).
Thus, after his fall and the healing process, Ignatius hadn’t transformed into this form until the unfortunate events of the 17th century, during the witch trials.
The story of his fall from grace (in accordance to my universe) and what happened in the 17th century is a tale for another day~