Ruins of Eldre'thar
From Wowpedia
The Ruins of Eldre'thar are newly discovered ruins of a Highborne city located inside Sishir Canyon. The ghostly highborne elves still haunt the area. The area is a night elf archaeology dig site and Nal'taszar can be found floating the lakes waters. Various conversations can be overheard among the named highborne ghosts.
Mobs
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Speculation
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This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
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Maybe something similar as in 
[12] Forgotten Rituals at Lake Elrendar has happended to the citizens, as Highborne Sorcerers are seen channeling at the lake shores.
