Hey yeah the Askandi, weapon is very strong! But ideally Helm shouldn't really be beaten till really clearing a large part of ZG. However the reason Askandi is so strong is because Onyxia's health pool is so large and thus ideally the player uses that item to help beat that but you are right it needs nerfing to a certain extent.
Also regarding DMF from my understanding that is how the game did originally load in the DMF as it was really a hidden extra zone that you found from loading up a completed save. But I will check this as I think it could of been changed in when the STV content came out back in the day!
Thanks for playing! More content coming soon tm