This looks very rare. This can be used to upgrade the spa to tier 3 at the base camp.
Talking to giles or the lady at the spa or using it on them or on the spa yields no results.
I'm guessing you need Tier 2 for the spa before this can be used. Can this be confirmed, or am I missing something on how this is to be used? Is it an item needed, or a way to skip needing to gather resources? I'm guessing the former.Hi.
Since one of the bases for homeopathy is that the smaller the dose of something, the stronger it is. Maybe it will be part of an elaborate joke where in order to upgrade the spa you need to have it but NOT add it.