User blog comment:NoNickNeeded/Urano Metria power source?/@comment-5268982-20130901094404/@comment-86.70.179.163-20130901105638

i don't think Lucy forgot it after using it against Angel, I think it was locked until Lucy reaches the level to cast it. 88 is the number of constellations, so I think that only celestial spirit mage can cast it, about the power of this spell I think this is the energy of the universe which is used, the same energy which allow the spirits to live