Velk

It's possible that there is some other bug effecting it, but double attack is two attacks at -4 each. Worst case maul is one at full accuracy and one at -4, and can be used every round instead of once per three rounds. Accuracy increases by two per level - finesse, accuracy and leadership perks increase it substantially as well. There's some faint chance at level 5 that a regular weapon that does double or more the damage of a maul one would be better in some circumst

Not sure if it was specifically winning but after winning the game accidentally, each time I have tried to use the autosave and previous autosave they have crashed on loading.

The weapons with a maul effect are far too powerful for their ease of access. Last game my sovereign killed the game ending quest dragon with two basic hits. Also, related bug/balance, maul's continuous attacks ignore status effects like stunned.

After the game/hero progresses for a while, sweep starts misbehaving - after the animation there is a very long ( 30+ second ) delay before the damage is applied

Had an enemy hero killed by a mantle of fire and counterattack damage - after he died the tactical combat remained on the dead heroes turn indefinitely.

Got this with the volcano guy ( delir of the pyre ? ) - when attacking him all that appeared was a lot of fire elementals and snakes - after killing them the game rewarded experience/quest text as if the boss has been killed as well.