Necros can sacrifice players to make Essence Emeralds. These are used to necro rez a dead player. Once you get sacrificed you can't get the lost xp back from a rez.
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Essence Emeralds cannot be bought from vendors, nor can they be sold to vendors...they can however be bought from real players in the bazaar. Essence emeralds are only made by a necromancer casting the spell "sacrifice" on someone....rules are they must be in your group....once cast they will get a message asking them if they wish to be sacrificed...once they click yes they die and you receive an essence emerald (its embued into a normal emerald so you must have these on you)bodies sacrificed in this manner CANNOT be resurrected. Essence emeralds are sold in the bazaar anywhere from 350 plat to 600 plat on Tunare server.