So you checked the room to the far west of the gong in the council hall, and the imp historian is no longer there?
Did you try going back to the Aleroth catacombs (level 4
map), and see if that one was still in place? It may have been removed when the imp took the first teleporter stone.
You can use the procedure in the topic
Lost Items - guide and directory of inventory files to get a replacement set of teleporter stones.
Alternately, if you are almost done the council quests anyway, you may just want to wait. If one or both teleporter stones are not in your inventory when you hit the gong to start the blessing ceremony, you can find replacement ancient pyramids near the start of the wastelands.
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