world of excal-heim
Potion
Legendary
The ascension into Lichdom has three parts; a container called a phylactery(Soul-in-a-Box), a Lich Conversion Potion(G-ma's Lich Juice), and 1 certified-metric-fuck-ton of necrotic power(#LifeHack).
The potion has a brewing DC of 20 or more. Failure will make a Oil of Decay potion, that is completely indistinguishable from G-ma's Lich Juice.
Cost: 24,000 GP to Brew