Mods for Rex

In a standard rancor team? speed, speed, speed. Most rancor teams use tenacity down so increasing potency is basically useless you mess up (and for the first round of attacks, generally you want you tmr to be faster than your tenacity down but you can use the first round to attack the guards instead). Might be an argument for crit chance and damage to reduce the time taken but that's more of a secondary thing