The poster probably intended "grid locking" to be different than perma rooted.
Setting an npc's run speed to 0 will perma root it.
Currently there is no support for locking the mob onto a grid.
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<idleRPG> Rogean ate a plate of discounted, day-old sushi. This terrible calamity has slowed them 0 days, 15:13:51 from level 48.
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