Noxon Demon

The Noxon demons were genetically modified demons that were experimented on by other demons, which resulted in them being indestructable. When Leo was a teacher at Magic School, he caught the Noxons and experimented on them in class with his students.

When Leo was "put on ice", The Noxons escaped and tryed to get revenge by killing Leo and all his students. They are successful in killing all the students but two. The two go to the Halliwell Manor in search of Leo, only to find Piper Halliwell with Billie and Christy Jenkins. Piper and the students think of a plan to vanquish the Noxons once and for all but The Triad get there first. They tell The Noxons to kill Christy's parents because they were getting in the way of the ultimate power. They do so, leaving Billie and Christy in tears. Piper and the students then vanquish one of the Noxons by sending them to The Astral Plane. The other one gets away.

One week later, after the funeral for Helen and Carl Jenkins, Piper and Paige orb to The Noxons but Christy jumps the orb. Piper wants to question the Noxon in order to get Leo back but all Christy wants is revenge. Christy is about to say the vanquishing spell when Piper uses molecular combustion on her lightly. The Noxon escapes and Christy is enraged.

Later, The Charmed Ones, Billie and Christy find the Noxon again. Christy and Billie use the ultimate power to vanquish him. Piper and her sisters realize that the ultimate power was right in front of them all along.

Spell to Vanquish the Noxons
Demon of Fire, Demon of Pain, We banish you to the Astral Plane.