Crystallized Drop of Eternity drops from Xavius in Emerald Nightmare.
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.
Based on the name, this item may be a crystallized drop of water from the original Well of Eternity that Xavius kept in his possession. If so, this would make it similar to Azerite.