A Goat torso perk; you can see it on the previous winners’ mechs, grosbite, Wepwawet, and Splatter.
You’ll also be granted the title of whichever number the tournament is and GOAT (Eg. 4th GOAT for this tournament).
To participate, wait for a tournament. You’ll then need to build a mech using only epics and below. To officially be in, you would have to post your GMT and IGN on the sign-up thread and PM El_Metre with your build.