The first game by Xaviant, the company who also produced the most unsuccesful Battle Royale game thus far with The Culling 2.

It's a pretty unique take on the FPS genre, with pretty cool "build your own arsenal" mechanics and fairly tactical combat where you're constantly switching spells for maximum effect.
It's also hampered by somewhat clunky controls and pretty boring level design unfortunately. Which means this is one of those interesting oddball games, rather than a really good one.