Magic Deficiency Disease causes the recipient to fall ill from the rapid loss of their Magic Power, which can either be from using a massive amount all at once or having it drained from another person. In dire cases, the disease can cause death if deprived enough of their Ethernano. Cures for this disease include potions and medicines to replenish Magic, as shown when Porlyusica created elixirs to cure Wendy Marvell and Carla.
- Fairy Tail Manga: Chapter 267, Pages 4-7
- Fairy Tail Manga: Chapter 468, Pages 12-15