Coin from Eldre'Thalas

Source
Coin from Eldre'thalas is a common archaeology artifact that requires 35 Night Elf Archaeology Fragments to solve, and allows use of one keystone.

Description
Once a Highborne capital, the city of Queen Azshara's arcanists fell into decay and ultimately depravity following the Great Sundering. The ruin is now known as Dire Maul.