Mana Crystal

Mana Crystals, also known as Mystic Gems, are the magic power source of demons. They were used to sustain the Dark Realm before it was destroyed.

Description
A mana crystal is a red gemstone that carries magical power. It was once one large gem that was held in the Dark Realm's castle, but it was split apart and scattered across the Human Realm following the Magical Girl's attack. It now takes the form of multiple smaller, irregularly-shaped stones.

Perhaps due to them once being a single entity, smaller crystals will react and glow when they're near to each other.

Effects
Demons are reliant on mana crystals for power, which means they're reduced to powerlessness when not in possession of any, and the strength of any powers they do have is dictated entirely by how many crystals they have. It seems a demon doesn't have to be in direct possession of a crystal to use its powers (i.e. it doesn't have to be on their person), as Druj is able to use hers even when her crystals are left at her residence, but their powers are still nullified if they don't know the whereabouts of a crystal they may once have had, or if a crystal has been taken from them by someone else.

According to Jahy, only demons are suitable to carry mana crystals and any human who tries to hold one will wreak disaster of a massive scale of great misfortune, but this hasn't actually been proven in practice. However, when the Boss kept Jahy's smaller crystal for a day, she did say that her shoulders began to hurt, she couldn't find the TV remote, and she found lots of split ends in her hair.

Known Holders

 * Dark Lord
 * Jahy
 * Druj
 * Saurva
 * Kyoko Jingu