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The shrine is a futuristic-looking draenei tombstone surrounded by pink crystals. On the tomb flashes the letters N, O, V, and A.
It is the memorial to the discontinued Starcraft: Ghost game. May it rest in peace.
Also, If you listen closely, you can hear "starcraft" music playing by her monument.
Nova as a blood elf Edit
According to WoWInsider, Blizzard took a blood elf female and dressed her to make her look as much like Nova as possible with a full white "ghost suit". She was stealthed and sitting in front of the monument. She was added one month after The Burning Crusade was released, but removed from the game two months after release.
This NPC is Nova Terra.
There also is currently a blood elf child on the northeast shore of Sunstrider Isle named Nova. She is accompanied by Jane, another blood elf child, with her cat, Kitty, and a half naked blood elf male named Jessel.