Just a super - tough and cool looking mech. Surprisingly has enough weapon energy for 8 plasma shots before running out of power, but that is usually enough to either A) Cripple enemy robot, B) Halve the enemy robot's health or, on the rare occasion C) Kill the robot.
Flak for shooting flyers, obviously. The I-13 uses 2 of the mega-mech legs (Mech Leg Titan for people who didn't start before Freedom Engaged)
It has a hover blade in the centre for long jumps, too!
-Will post on the CRF upon commenter's request
As you can see, I showed this robot off in various different maps, and the scoreboard is from a Team Deathmatch on Spitzer Dam (online, not AI)