I've heard the term "T1" thrown around multiple times around here, but I'm unsure exactly what T1 entails. Could someone enlighten me? Preferably with a TL;DR version if at all applicable? 

Additionally, I need a sparring partner to test a character concept out that I've yet to see demonstrated in the Arena section: fighting as a four-legged creature. Either this character approach doesn't work at all whatsoever when dealing with super-powered bipeds, it's banned due to the rules and regulations that pertain to proper Arena combat or it's merely never crossed the mind of anyone until now.