Mobs can go wherever they want in Kedge, since its fully underwater. Z axis limit wouldn't be of any use. I was about to write exactly what Mollymillions wrote about blocking the mob's possibility to move higher than a certain Z limit when i was reading that post. As long as the water is flat, the idea seems ok. Tho for zones like Sirens Grotto, it remains a trouble since there's several levels of water... A mob could jump from 1 area to another one if agroed and then fly over the water or move to the ground.
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