well another huge thing is the new death system. Death's should knock down item drop chances, and it'd of course increase overall time spent training. Brigid should be able to /cast revive, and if they can't they should have an easier verison of Diancheht's revive.
I think that it'd be interesting to see larger instances like Crypt. Something that made it really easy for me to lame crypt as a Brigid mage was the waves all in the same, very small area, as you can see i never need to really make new directors. I can basically lame them because I know where they walk... there's nothing exciting or surprising. Same old thing.
as you can see, there's little for anyone to do besides one person running through it flawlessly.
I'd really like to see a more random mob/boss system aswell, where you weren't sure if you'd get two priests two vamp guards this round, you may get 6 vamp priests 0 guards or 5 guards 1 priest. It makes it more exciting not expecting the same every round.
This also goes for the boss. Kvasir is known to be VERY easily done by Brigid, what if there was a 50/50 chance on what boss you'd get that trip? You'd either face Kvasir (Very weak to holy damage, resistant to physical) or Fjalar and Galar, Dwarf Brother Warriors who are incredibly resistant to fire/holy/spells and quite weak and killable with swords with a decent healer.