There's enough xp for every one to level up (a couple of times, 3.7M), i have downloaded the savegame. I guess he did it just as an exercise, but still i can hardly see how you could survive the chaos temple with 8 (vi+urq) lvl 11 "heroes" (or life/knowledge for that matter). Throwing a death bomb, praying and reloading a zillion times would be the only chance i'd see, but i doubt that was the route he took
(Deaths range between 0 (vi) and 9 (urq)), kills between 40 and 200.