|Name in Japanese||マグネシア|
|Debut (Anime)||Shakugan no Shana Second Episode 15|
|Appears In||Anime, Light Novels|
Magnesia (マグネシア Maguneshia ) is Fecor's signature Power of Unrestraint, which creates a storm of heavy cubical particles. These particles are controlled at Fecor's will. Its streams inflict heavy blows upon the enemies in spite of its true purpose as a defensive maneuver. They can also be concentrated to form giant objects to crush Fecor's enemies.
Magnesia looks like a group of grey particles combining to form something. When they drop, they look like multiple brown cubes, or an extremely large cube.
Magnesia is used to protect the Divine Gate when the Flame Haze Army tried to stop the return of the Snake of the Festival. It is easily cut by Tenmoku Ikko with the Nietono no Shana when Fecor tries to use it to defend himself when Shana summons Tenmoku unintentionally.
|Offensive||Aster • Danzai • Endan • Eternal Pitfall • Fist of Aten • Hien • Improvisational Poem of Slaughter • Inverna • Labyrinthos • Ra's Throwing Stone • Rainbow's Heaven Sword • Rubble Giant • Shinku • Stigma • Tōga|
|Defensive||Alcázar • Cradle Garden • Magnesia • Qadesh's Heart Chamber|
|Utility||Anti-Seal • City Devourer • Crypta • Fūzetsu • Humanize • Kaze no Tenrin • Long-distance Communication • Qadesh's Blood Seal • Shinpan • Tatsui no Gen • Yogasa|
|Miscellaneous||Purifying Flame • Psalm of the Grand Order • Tuning|
|Universal||Dragon Tail • Grammatica • Qadesh's Blood Pulse • Special Ability|
|Divine Summon||Saiki Reisō • Shōhi Ginsei • Tenpa Jōsai|