Shukufuku no Campanella EP12 - Blessing of the Campanella

Oasis and Aberdeen and Avril arrive at the mine, and are attacked by a horde of crystal monsters. Aberdeen and Avril remain nearby to repel as many of the monsters as they can as Oasis goes ahead. They appear before a great tower where the Waterwheel of the Heavens is. They are attacked by yet more monsters as they ascend the tower, so Nick and Garnet remain behind to keep the monsters from following.