Kidneys are essential to the urinary system and also serve homeostatic functions such as the regulation of electrolytes (including salts), maintenance of acidâbase balance, maintenance of fluid balance, and regulation of blood pressure (via the salt and water balance).
Xazi Smolderpipe is a goblin vendor found in the Underbelly beneath Dalaran. [59.0, 59.0] She can do repairs.
There is a black soul gem in the Cracked Tusk Keep vault, to the right of the entrance, behind some iron bars. There is also one in a half-buried pot in front of an altar in Geirmund's Hall, in the room just past Geirmund's corpse. One can be found at the bottom of the pond at Steepfall Burrow, near the chest.