I believe this is the bodytype (11=Untargetable). Look at what RZ is, there should be 2. One who is untargetable, the other who spawns when the conditions of his demise are met and makes him targetable.
http://www.eqemulator.net/wiki/wikka...ka=BodyTypList
However, keep in mind most of those zones are only captured at zone-in status, so unless someone captured the full RZ quest to the fight, the real RZ might not even be in the npc_types database yet. But you can create him by copying the bt 11, and changing to his normal targetable bt.
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