Magic

Magic is the element in Reign of the Seven Spellblades franchise. It was originally the authority of the dead god, which was passed onto the mages once it was slain.

Most spells require incantations consisting of latin words; the longer the incantation, the more powerful the spell but the harder it is to cast and the more vulnerable a mage is to attack while casting. Normally, it's impossible for a first-year student to "double-cast" (cast a spell with a two-word incantation), though Chela can pull it off in elf form. These spells escalate up from certain very weak spells, called "spatial magic", which can be casted nonverbally, but mages have to be creative to use them effectively, all the way up to reality-warping "Grand Arias", which require incantations minutes long.

The power to cast these spells are also reliant on elemental affinities and on their "etheric body", which appears to be an extension of their souls. An injury to the etheric body can dramatically weaken a mage even if there's no sign of physical injury. Mages also require some external focus to cast, which can be either a white wand or an athame. The use of the latter allows mages to use Sword arts as a way to combat nonmagical opponents. However, spells can be counterspelled if a mage synchronizes to their elemental cores. Nanao can do this instinctively with just her sword.

The ultimate danger of practicing magic is being "consumed by the spell".