Grimomen's last stand was in his Pitcastle where Shion arrived to save his friends. The demon planned to have Shion turn into a demon and be the lord's right-hand man, killing on command. Instead, Shion used his magic to burn Grimomen's wings off, causing the beast to change his plan - to killing Shion. Combining magic and his demonic arm, Shion felled Grimomen by punching him into the sky.