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07-28-14, 11:11 AM   #5
Rainrider
A Firelord
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Join Date: Nov 2008
Posts: 454
I suppose it is a unique identifier for the current zone. Maybe spawnUID is only required to be unique for the given npcID, but the server has to differentiate between all the mobs in a given zone without checking two numbers but rather just one. As it is there for pets too, it would be interesting to check whether this number changes on zone change.