Eyghon.
The Fortress of the Earth. The Demon Lord reigning high above every single Outer Demon that threatens the planet. A monster that measured over ten kilometres in size, easily equalling the mountain range surrounding it. A pillar of power far beyond anyone's comprehension of what an Outer Demon should look like.
Throughout the long war against the Outer Demons, humanity struggled against the Demon Lords. Especially against an oddity such as Eyghon.
It was utterly immune to magic. It had skin tougher than diamonds. It was massive in its frame and impervious to any external attack.
Even the Blackburn House, the one Vampire Clan with the most experience dealing with Eyghon, fell short in dealing with the enigmatic Demon Lord.