It doesn't seem like I got any sort of buff from it. It was a very satisfying thing to do nonetheless... still, I'm curious.
For those that want to know how to cure it:
Edit: It seems the blessing will make the druids in Bentbranch Bog north of Sayuka recognize you as an ally of nature, however you still need to pass a 13 Diplomacy check before they notice it. If you do their bidding you will more or less declare war on the Royal Deadfire Company. More here.
Edited by omgFIREBALLS, 29 May 2018 - 04:48 AM.