Plien
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I spectated using PVE spectator and I tried to leave with the command and it wouldnt work at first so I did .sp player on someone in Arena 2v2 and it went there and when I got out of the Arena my inventory was gone, bags were gone, all equipped gear was gone everything. I've had my priest (Plien) for a year now and I've had full pride , full PVE set, bunch of consumables, toys, transmog, etc.
It has to be stored somewhere in the database.