I checked out the Magic Mirror of the necromancer for Tav. It gave 3 possible entries:

1) I see my loved ones safe and sound.
2) I get the tadpole out of my head.
3) I see my enemies suffering.

Yeah, that's pretty generic all right. Covers all bases though.

Actually, now that I think about it, the origin characters don't even mention the tadpole? That says that Tav above all other characters is defined by getting it removed.