Maxwell's Demon: Negation of the Second Law of Thermodynamics (熱力学第二法則の否定, Netsurikigaku Dainihōsoku no Hitei?) is the Noble Phantasm of Maxwell's Demon. The infinite heart that greedy humanity dreamt of. It is a perpetual motion machine manifested by the denial of the Second Law of Thermodynamics. However, it is not a perfect perpetual motion machine but merely something resembling it. It has an effect that allows it to produce close to an infinite amount of energy; however, there are several conditions to its invocation.
A Noble Phantasm of nothing but contradictions that creates close to infinite amounts of magical energy with the power of science. Strictly speaking, this Noble Phantasm's operation needs magical energy to move Maxwell's Demon so it cannot be called a perpetual motion machine. This is essential to the theory that denies Maxwell's Demon as it is understood: "To distinguish between momentums, energy is necessary."