Barrel Rock + Muse-A → Mystical Sand

Barrel Rock + Giant Turtle Who Feeds on Flames → Boulder Tortoise

Barrel Rock + Rose Spectre of Dunn → Mystical Sand

Barrel Rock + Key Mace #2 → Mystical Sand

Barrel Rock + Fairy Dragon → Stone D.

Barrel Rock + Lady of Faith → Mystical Sand

Barrel Rock + Warrior of Tradition → Mystical Sand

Barrel Rock + Succubus Knight → Mystical Sand

Barrel Rock + Ill Witch → Mystical Sand

Barrel Rock + Fairy of the Fountain → Mystical Sand

Barrel Rock + Amazon of the Seas → Mystical Sand

Barrel Rock + Nekogal #2 → Mystical Sand