Non expert, but what you have to know is that in true D&D, the cure for the tadpole would have been
to simply kill the player, extract it, and resurrect them
. In game, this is handwaved because
. Presumably, the tadpole resurrects with the player each time. In my opinion, Raphael comes off as a bumbling idiot, though probably not on purpose. There's really no reason for the player to indulge his "schemes".
In his dedication to giving you a terrible deal, he sabotaged himself through his own hybris.
