Eternity Magic: Fairy Heart, also known as Lumen Histoire is Fairy Tail's greatest secret and a very powerful Magic, said to be superior to the 'Three Great Fairy Magics'. Fairy Heart is a source of infinite magic energy, stemming from a combination of residual magical energy left in Mavis' body due to the curse of Ankhseram and decades of failed experiments by Precht in an attempt to resurrect her. Its Magic Power potential is claimed to be so great that Mavis herself stated that Etherion could be fired infinitely if its power were to be sourced from Fairy Heart.
Powers and Stats
Name: Eternity Magic: Fairy Heart, Lumen Historie, Mavis Vermilion Body
Origin: Fairy Tail
Classification: Infinite Magic Source
Weakneses: It is a source, not a weapon; Dangerous for users because of Mavis' Ankhseram Black Magic