Thanks for taking a look. I like the concept of Maul, it makes things dangerous. But being able to nearly one-shot people based on luck is kind of silly at times.
I agree, and if you want Maul to last shorter for yourself, go ahead and change the -10 on accuracy to -20, that will remove roughly 30% accuracy each round and limit that accuracy down to roughly 4 rounds. (At present it is roughly 6 rounds for accuracy)
If you want it to stop increase the attack stat on Piercing from 2 to say 4, then an attack of 30 will last roughly 4 rounds as well. I feel that it is pretty well balanced right now, for the intent of the maul. Most of my maul attacks last roughly 2 - 3 rounds at present conditions.