For the fight with the skeleton mages; if you leave one character down the corridor, and bring the other up until they are seen, you can run back leading 1 or 2 of them to your other character. By the time they get there they are out of stamina, and they are much easier to kill when they can not keep running away to attack from a distance.
This might work for the statue room as well, or could at least split them.
