>>11285719
...See, the potion is required to allow a sacrifice to maintain her blessings, and in turn make sure that Elvish society and the forest will keep on living. But taking the potion means that the blessings become more potent, and sooner or later they will become too much: at that point, instead of keeping the forest fertile, the sacrifice will become part of the fertile forest, mutating into some kind of natural feature such as a giant tree, or a lake... In your case, you'll probably become some kind of water spring, probably in the shape of two gigantic boulders from which chalk-white healing water sprouts. It will happen an unspecified amount of years or decades in the future, but it WILL happen at some point.
The soul of the sacrifice becomes a genius loci, forever stuck in the location where their mortal bodies became part of the forest. They still retain their memories and personalities... But as nature spirits, they are vulnerable to rituals and prayers, which can compel them to do what the priestesses want. Quite a lot of nature spirits become even more arrogant than what they were in life, becoming convinced that they're minor gods who "graciously" decide to help the infer- I mean, the unfortunate mortal elves. But in reality, these spirits are still compelled by the rituals to serve mortals; they just believe that it was their own idea all along.

>I wish to become a slug monstergirl with a cute husband to get impregnated by.