Sealstone

Sealstone is a mineral found in Tortus.

Description
Sealstone is an ore that is able to dissolve Mana, but it has a limit as to how much it can withstand.

Trivia

 * The Sealstone Dienleed Avatarl used to imprison Yue deep within the Great Orcus Labyrinth had a greater percentage of organic matter incorporated in it due to him having a higher affinity with Metamorphosis Magic than Creation Magic (hence why Hajime Nagumo had difficulty transmuting it while freeing her).