[Charmy]

Depends on what type of leash, a leash like the emperor has at first, well sadly i have not a single clue how that works, but a leash like TT has when you fight her, (her leash is if you try to pull her out of her dome and she hits the archway she depops and repops witha full detrimental dispell, i.e. any bad spells on her (tash, slow etc) go bye bye) this type of leash could be done by making a simple perl script and using the EVENT_WAYPOINT sub to execute a depop and repop. i suppose a simliar thing could be used to leash like the emp has, but if i remember correctly and it has been a while since i killed emp, he actually appears to be on a leash like he is teatherd to a pole. so i am really unsure on how to accomplish this kind of leashing, but other than that, i was also thinking, and i am not sure if npc's are subject to encumberence or not, but you could just make an item called "the Rock" and make it weight 100000000000000000000000 pounds. but i don't know if npc's are subject to encumberence rules....

I would go with the 24 hour duration root that can't be dispelled, i was on my server today and i noticed that roots didn't break from nukes, they only broke based on the MR of the mob, some of the higher lvl mobs it would break faster and some lower level mobs, (with 15000000 hp just to test) the root didn't break for the full 3 mins while i was nuking the whole time. so i think your best bet would be to do the 24 hour root for now atleast, just add a few hundreded thousand posion counters to the spell effect and it shouldn't ever get cured or dispelled.