Wyll ... that is actualy the same situation as with Zevlor, he dont give a damn about Halsin, yet Wyll will leave us, if we join the Gobilns ... so yes, this one could be good argument, if we count knowledge from previous gameplay, since otherwise there is few hints that he will not be happy about us, yet i was quite surprised for the first time, since i would never gues that he will leave us to be honest. O_o
This isn't really relevant to the discussion but I just had to take a moment and address this because I am surprised that you were surprised. It seemed glaringly obvious to me from the jump that Wyll would leave if we joined the goblins. I would have been more shocked if he'd stayed after joining up with them. I am really curious as to why you were surprised.
Just have Minthara explicitly promise you power from the Absolute if you give up the location of the druid grove and/or participate in the raid. You'd be able to join the cult with their recommendation. That's a perfectly valid (non-murder-happy) "evil" motivation: power at the expense of others. This could even work for more neutral or even good characters: you're trying to infiltrate this cult in order to learn more about the tadpole in your head and/or to eventually take down the cult: sorry tieflings&druids you're just collateral damage/it's for the Greater Good.
You can do all that even now, just presuming that ...
Is that sentence really so important? :-/ Do we really need DM to hold our hands and give us huge neon sign on every single crossroad? :-/
Back onto the topic though, maybe you're just way more confident than I am-you probably are honestly, I'm not all that confident most of the time-but I can't imagine a reasonably intelligent person taking that much risk on their own presumption. Joining up on the presumption that you'll get power feels too flimsy to me honestly. It feels like it relies on your character making too many assumptions based on circumstantial evidence. Sure, that would be in-character for some evil characters, but I think there are just way more ifs involved in the evil path than the good path. If you go with the good path, you're getting an opportunity to remove the parasite, and if that fails then you can just move onto the next opportunity. If you side with the evil path, you get an opportunity to maybe control the parasite, while also surrounding yourself with people who have the ability to mentally manipulate other people infected by the tadpole without their knowing (how will you know if they're doing to you what you may have done to others already?) And if you're wrong then at best you've wasted precious time you could have been searching for a cure and also lost a potential healer in the process.
Which actually makes me think of a related issue. Let me know if I'm forgetting about something we learn in-game, but I don't think we actually know enough about the cult in general. Not in the sense that we don't know their conection to the tadpole or anything; we don't know enough about it as an organization. How much influence do they actually have? How long have they been around? The kind of basic information that would be pretty reasonable for a character to ask upon first encounter. Do we know whether or not this isn't just a bunch of drow with tadpoles who've mentally dominated and intimidated goblins into doing their bidding?
