Question: is aegon targaryen immune to fire?
Answer: Targaryens are not immune to fire, not according to Martin. ... This was a one-time occurrence, according to Martin, and had less to do with her Targaryen surname than it did with the effect of blood magic she was invoking. Khal Drogo's pyre was more than just a cremation — Daenerys was burning the witch Mirri Maz Duur.