I had to protect you

The three gems summoned their weapons. A giant robotic creature burst through the trees. This wasn't a gem. It looked like a machine almost, and I didn't want to be reminded what I thought it was, either.
It was in a sphere kind of shape, having four metal poles to hold it up. In the middle of the machine, lied a rotating center piece, and a small circle, designed to shoot blasts of energy.

That's when it started to shoot.