Grimoire Law

is a Caster Magic Spell used by Hades.

Description
It appears to be a malefic form of Fairy Law. Its color is a darker variation of Fairy Law's color. It is said that, if used against Fairy Law, it would bring horrible destruction. It was almost used against Master Makarov, which would have resulted in a stand-off with both Masters and their respective guilds being wiped out.