Stevelin7, I'm not sure I understand what you mean by binding and how that relates to the tadpole. I think having it beyond the tadpole is a bit out of left field writing-wise, especially making it a new mechanic, as JandK says. My suggestion was just enhancing use of the Illithid abilities we've already got to allow for a sensible way of turning otherwise rabid evil characters to your side in the long run. Could you explain what you mean by binding?