From what I've read there are indeed repercussions for using the tadpole. In the Moonrise Tower(act 1B) there is supposedly an NPC who has the ability to "Authority" the player if they have used the tadpole a set number of times. What I've read is 6 uses(which I believe changes the Illithid Wisdom option in the game to True Soul Wisdom). It is currently unknown if using the class specific powers counts toward that 6 uses to be controlled or if getting the Mark of the Absolute allows a toon to be controlled the same way we do to those that bear the Mark. I am particularly interested in doing some testing with this hopefully soon when Larian releases the rest of act 1.
