Worst part about Orpheus becoming a mindflayer.. he doesn't even have a tadpole in his head. How the fuck does he turn into a mindflayer? Larian just REALLY wanted someone to turn into one I guess
That's what really didn't make sense about that scene to me. The Chosen 3 also are not a single Mindflayer between the three of them, and they are able to compel the Netherbrain with the Netherstones. It's a ridiculous contrivance.