Demon's Horn was a dark guild that had been a subordinate guild to Grimoire Heart. It often came into conflict with Angel's Feather and later Fighting Spirit after the former's forced dissolution by the Magic Council. The guild was subsequently wiped out after an internal dispute and battle with Fighting Spirit.
|Dark Mages||Leaf Valentine|
|Deceased||Akatana • Ikatana • Necron • Omicon • Oushi • Uma|
|Defected||Selina Victoria • Tengu|