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 Set up an invisible mob.  Set a proximity on spawn.  On enter, check the client's level.  If too high, move person/do whatever you want.
 I find I learn more if people point me in a direction I need to go, then muddling through it myself.
 
 You want sub EVENT_ENTER and quest::set_proximity(minx, maxx, miny, maxy , minz=0, maxz=0).  Shouldn't be too bad, but if you find yourself head-desking a few times, give another post.
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