Their are consequences for using the tadpole. Pretty dire ones datamined so far. An item you get in the underdark heavily implies what one consequence is.
[spoiler]Ncps can control your mc. Probably worse than ethels masks forcing a wisdom save or lose the turn every turn. The mindflayer in the underdark strengthens your tadpole but gives you a item to resist control. I'm pretty sure he lied about wanting to remove the tadpole and really secretly wanted to strengthen it for unknown reasons. It knew what it was doing in my opinion.
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So I assume certain NPCs, such as enemies can control you? Maybe it will be implemented in an interesting way but at this point, I'm not sure I really care to be honest...I love a mystery but for whatever reason this storyline hasn't inspired me at all. Everything is so mysterious I just want to be pointed in the direction of an arch rival to fight .
