Nefaria is then kept in isolation and under observation by the Avengers, and it is discovered that the process to empower him makes Nefaria immortal but vulnerable as his body reconfigures itself. Whitney Frost, also known as Madame Masque and the daughter of Nefaria, attempts to find a cure for what is believed to be his deteriorating condition. She hires the Ani-Men to attack Avengers Mansion and free her father. While battling Iron Man, Nefaria's life-support system is severed and his weakened form is crushed by a stored Jupiter Landing Vehicle. Nefaria briefly reappears some time later as a corpse reanimated by the Grim Reaper. Grim Reaper directs Nefaria to attack the Avengers, but loses control soon afterwards and Nefaria dies once again.