I don't know how hard those things would be to code in... but I find the idea very interesting. Since this is an emu server you can get away with things that would never be allowed on live, might as well take advantage of that
Here are some ideas I came up for a Plane of Chaos type zone because im bored:
1) Perhaps start if off slow with a lot zone mobs that randomly grav flux and knockback(make lev uncastable in zone), but can be experienced with a group or soloed
2) Raid type mobs that AE unresistable charm
3) Unique mobs that attack the clerics only
4) Mobs that run away from you instead of at you and can't be rooted(would take zone pathing I know)
5) mobs that can't be seen or targeted(only way to kill em would be AE spells)
6) mobs that hit for 10000 and are immune to spells, but run super slow and shadowstep randomly(my favorite idea)
7) Tons of crazy traps that change locations
8) Pet only dropable armor and weapons with like +2k hp and make the pet hit for 150
9) No rent armor with crazy stats
10) Anything else that makes no sense and adds to the confusion of the players and makes them want to leave as soon as possible... but the loot would be very good and the exp bonus should be rediculous... like 60-80%