Thunder Arrow

Compound Magic: Thunder Arrow (複合魔法『神鳴の矢』) is a lightning-, steel-, and wing-based Compound Magic spell.

Description
The Steel Magic user creates a railgun, which the Lightning Magic user fits it with a large arrow that has a lightning bolt-shaped tip. The Wing Magic user supports the other two from behind. Targeting is also adjustable, made easier by the Lightning Magic user's ability to sense mana.

The arrow is strong and fast enough to shatter a crystal after piercing through a hill twice. If the Lightning Magic user is strong enough, they can fire off the spell by themselves.