Megiddo (I stole this ._.)

"A Physically driven which uses Magic to form multiple, very large magnifying-glass water constructs in the air, which are actually lesser water spirits transformed to suit the user's needs. This focuses the energy of the sun into a devastating heat beam capable of reaching thousands of degrees. The constructs disintegrate after use, but the energy needed to replace and maintain them is very little. Because they are clear, thin lenses of suspended water, the constructs are almost impossible to see. The size and number of lenses can be changed to varying effects: decimating 1000 armored soldiers in a single shot to killing a single target instantly and without sound. By gathering water droplets from the water vapor in the atmosphere, in the shape of convex lenses in the sky, They condenses sunlight to the point where it becomes a massive laser beam, similar to using a magnifying glass. The skill has low requirements; the water droplets can continually be replaced when they evaporate. The massive energy beam is a physical phenomenon, and therefore cannot be blocked by magic-disrupting barriers."


It cost a Large amount of Mana
It can only be used at daytime