The Demon Sealing Eye is a special eye that can seal powerful spirits.
Only descendants from certain lineages of elementalists have a chance of being born with it, and the birth of a child who posses the eye is a rare instance. It is an extremely rare spirit crystal.
Due to numerous cases where demon sealing eyes have powerful spirits sealed inside of them, the possessors are generally regarded as dangerous and in most situations are persecuted or used as weapons by authorities.
- Milla Bassett (has lost its power after unsealing the spirit Crusaders)
- A girl from the «Instructional School» (perished at an early age after being used as a weapon)