A contract between Master and Servant. I'm a 'Heroic Spirit', summoned from another age to fight in a war. I've been disconnected from my usual Master, who I was contracted to fight for.

[Berserker lifted a pistol from the hip of his armor, firing a few rounds in the open air without so much as looking away from Vera. One craft suddenly burst, exploding in mid-air from afar as it was struck by those suddenly high-powered rounds. The pilots didn't in any way know who the hell fired them, but they would find out soon enough.]

A contract would make you my master and supply your magical energy to supplement mine. In return, you would gain some strength from your association with me.