View source for Maxwell's Demon (3.5e Monster)

===Lore===
The original Maxwell's Demon was "created" by an enterprising Elan Cleric named Maxwell, who, over the many millenia of his existence, slowly became obsessed with defeating thermodynamics. When the third god he worshiped was slain by a Balor Wizard, the backlash ripped apart his slowly decaying sanity and he turned to the Abyss for inspiration. He achieved his goal when a scroll mishap after a particularly long night of research and combat transformed him into a Demon. Some say that he, the first of the Maxwell's Demons, is still wandering the Abyss somewhere.

Others say that this story is complete nonsense. Citing old adventurer's journals, they claim that Maxwell's Demons are called that because they were originally discovered at the surfaces of "Maximum Wells", wells filled with superheated air compressed to be denser than iron.
Article Balance	High +
Author	Foxwarrior +
Challenge Rating	12 +
Identifier	3.5e Monster +
Name	Maxwell's Demon +
Rating	Undiscussed +
Size	Medium +
Subtype	Chaotic +, Evil + and Extraplanar +
Summary	Scary monster that can control its permeability to energy and matter. +
Title	Maxwell's Demon +
Type	Outsider +