Basilisk Oil

Basilisk Oil is a Consumable (Potion). When used, it restores a petrified creature back to its organic form.

Extracted from a basilisk's gullet, this thick, grey oil swirls slowly in its container.

Properties

Administer the potion
-  Melee: 1.5 m (5 ft)
- Turn a  Petrified creature back to its organic form

 Throw the potion.
-  Range: 18 m (60 ft)
- Turn a Petrified creature back to its organic form
  -  AoE: 1 m (3 ft) Radius

Sold by:
-  Boney at the Circus of the Last Days in Rivington (2 per long rest)
-  Quartermaster Talli at the Last Light Inn (1 per long rest)
In the Apothecary's Cellar in the Blighted Village at X: -667 Y: -355
In a heavy chest behind a wall of spiderwebs in the Underdark at X: 81 Y: -206
On a table in the secret basement of the Arcane Tower at X: 146 Y: -421

This item can be administered to the six Petrified Drow ( Arcagh,  Artimezt,  Dhourn,  Izwae,  Moy, and  Tecothy) in the Underdark.
This item can be administered to the three Petrified Debtors in Hope's Prison. Doing so, however, turns them into dust and lets them disappear.
This item can be administered to  Efrin Hammerborn in Auntie Ethel's Overgrown Tunnel. However, doing so without killing Ethel first results in him dying from his condition.

Unlike most potions, Basilisk Oil cannot be directly consumed by the user, but must instead administered to another creature or  Thrown.
To get the Basilisk Oil in the Arcane Tower, the party must first obtain  Guiding Light to get to the basement of the building. Alternatively, the party can pass a perception check along the eastern wall on the top floor of the Arcane Tower, revealing a lever that unlocks a path to the basement from the ground floor of the tower.