Serum formula is the 31st clue. It is a Madrigal clue and was located on Cahill Island, Ireland.


This clue isn't actually an ingredient. It is a formula on how to put the other 38 ingredients together so that they can be assembled properly.

The Serum FormulaEdit

For Gideon Cahill's serum:

One portion = one ounce

Start with one portion of water.

Add 1/8 portion of each of the ingredients on the list given to Luke Cahill.

Add 1/16 portion of each of the ingredients originally told to Jane Cahill.

The rest of the formula is unknown.