Black Dagger

Little by little, the half-wolf was losing control, until there came a time when he could no longer hold that gigantic amount of water. It was a task that, as much as it didn't use up the half-wolf's mana, it still made him tired.

The moment Luke lost control of that pillar of water, Erwin took control of the feat.

With a snap of his right hand, the blue-haired wizard made that pillar of water grow much larger. It flew upwards at a gigantic speed. Quickly the pillar surpassed the size of the academy's forge, and then it went higher and higher until it reached the clouds. 

After that, with a second slap, Erwin made the entire pillar disappear, turning it into a strange mist. A cloud ended up forming in the clear sky of that beach, at the same time a gigantic amount of salt was falling to the top of the sea. 

"You did very well for a beginner boy, very well..." Erwin said, giving Luke a gentle smile.