Sea Dragon's Roar

Water Creation Magic: Roar of the Sea Dragon (水創成魔法『海竜の咆哮』) is a water-based Creation Magic spell.

Description
With an open grimoire, the user points their arm at a target, manifests the head of a sea dragon with sharp teeth, and fires it at the target. The user could change the spell's direction mid-flight should it miss.

The spell is powerful enough not only to rip off the arm of a powerful mage but also to blast through several walls.