Grimoire Heart

"Grimoire Is More Powerful Then Darkness Army Manny That Was Only Thing I Fear" -Asuma

Grimoire Heart is the enemy of Kaijudo Dragons that who try to destroy Kaijudoa in war but as also the member of Darkness Army's Alliance even that also Asuma knew that They more powerful then Darkness Army but Manny did know that Hades trying to invade Kaijudoa

also Grimoire Heart was led by Hades himself even that the Grimoire Heart did knew that Kaijudo Dragons and Kaijudoa Army is forming as one but also They are very powerful Attributes in Kumogakure