Baldur's Gate 3 has a 'hidden skill tree' for Illithid powers

The central premise of Baldur's Gate 3 is pretty straightforward: You have an illithid tadpole in your head and you want it out. But what if you decide that you don't actually want that at all—that what you really want is even more mind flayer madness? The Baldur's Gate 3 Steam page states plainly that players can "embrace corruption and become ultimate evil" if that's what they're into, and today Larian finally got around to explaining more about how that's going to work...
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