User blog comment:Miskos3/Fairy Tail 521: The Strongest Wizard, Review/@comment-24546844-20170212021132/@comment-7418318-20170212170938

Well... that might even be true.

Remember that the Tenrou Jade was supposed to have become soaked in evil and it was resting in that very cathedral for several years. Maybe some of that evil seeped out and became a curse on the place. :P