Twiceborn Crone doesn't have much to say...

[Saxon]

Do not forget there is a chance of getting a boost to your death magic when you are re-born. Depending on your situation, you may want to cast twice born on someone who already has high death magic in the hope of getting another level.

[sansanjuan]

Interesting... The crone in question is already D10 unboosted...
-SSJ

[K]

Don't get your hopes too high. The chance is around 10%.