Rainbow's Heaven Sword (虹天剣 Kōtenken ) is Merihim's signature Unrestricted Spell. It fires a destructive ray of rainbow. While charging the spell, a halo-like rainbow light glows on Merihim's back, resembling wings. This spell is counted as one of the greatest offensive powers of all time. He also has the mirror-shaped Rinne army called Aeria, which acts as the reflector for his fired Rainbow's Heaven Sword to his enemies when they had evaded the first attack but would instead fall under his "next" attack or the reflected Rainbow's Heaven Sword. He is able to use the "Rainbow's Heaven Sword" to defeat Orgon in one strike.
|Offensive||Aster • Danzai • Endan • Eternal Pitfall • Fist of Aten • Hien • Improvisational Poem of Slaughter • Inverna • Labyrinthos • Ra's Throwing Stone • Rainbow's Heaven Sword • Rubble Giant • Shinku • Stigma • Tōga|
|Defensive||Alcázar • Cradle Garden • Kaikin • Magnesia • Qadesh's Heart Chamber|
|Utility||Anti-Seal • City Devourer • Crypta • Fūzetsu • Humanize • Kaze no Tenrin • Long-distance Communication • Qadesh's Blood Seal • Restoration • Shinpan • Tatsui no Gen • Yogasa|
|Miscellaneous||Purifying Flame • Psalm of the Grand Order • Tuning|
|Universal||Dragon Tail • Grammatica • Qadesh's Blood Pulse • Special Ability|
|Divine Summon||Saiki Reisō • Shōhi Ginsei • Tenpa Jōsai|