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And in the end it doesn't matter, you are healed from the tadpole. So why not use it? But of course we don't know this before - I even wonder if the Emperor could now it. I think (but this is just my opinion of course) that he thinks there is no cure and we are about to transform anyway so could use tadpoles to be stronger and it wouldn't change anything.

Because:

1. You are roleplaying a good character anything that moves you closer to being an evil creature is to be avoided. In BG1 resisting the pull of evil was rewarded. You could either embrace evil and have the ability to use vampric touch or you purify the unholy power and focus on healing others.

2. Right he believes the cure in both impossible *and* undesirable. He's evil - his nature compels him to dominate and control others and he wants to become the same.

And it would be nice to prove him wrong the same way we proved Sarevok wrong in BG1 and ToB - Sarevok believed that we needed to embrace Bhaal's powers to succeed. We didn't and indeed his choice embrace the evil inside was his undoing.

So, again, I would like to have good ending - one that give us a choice between competing evils but of the two evils Orpheus is the lesser one.

The Emperor might not have known he was serving a devil but if he efforts didn't corrupt the government of Baldur's Gate he would have been removed from his position by the devil. I think this is a place where Larian understood the FR lore and used it appropriately - the Knights are agents of corruption whether they know it or not . . .