18. You can disguise yourself as tiefling, steal the idol of Silvanus to have the druids attack the tieflings and then leave the scene abandoning the tieflings to their destiny. Right now the tielflings kill all the druids and thank you for helping them. Not exactly the outcome I was expecting.
I'm not sure it fits this list, but I also realized that if you can take Wyll with you when you talk to Minthara and accept to attack the grove he will leave the party and warn Zevlor. When you go to the grove, Zevlor mentions the fact that Wyll warned him, but will still let you in (not very smart IMHO) and you are once again given the choice to side with them or betray them. If you decide to betray them though there's no way to complete the mission. Minthara just keeps saying there are more tieflings to kill but I've checked everywhere. I also believe Wyll should take part to the battle in this case and fight against you.
