|Romaji||danzai no tsurugi|
|Debut (Manga)||Chapter 109|
Ensis Exsequens (Executioner's Sword) is a high-level, extremely destructive attack spell that wraps the caster's hand with magical energy, which stabs outward in the direction of the outstretched fingertips in the rough approximate form of a blade.
In terms of its effects, Ensis Exsequens causes damage by instantly converting matter from a solid (or liquid) into a gas, via a violent phase transition in order to attack its target; any living opponent caught within such an effect would thus be instantly vaporized and killed. As such a phase transition also absorbs an incredible amount of heat energy in the process, the surrounding area as the spell plummets in temperature as a direct result, causing this spell to actually be a two-stage attack – if the target were to be able to avoid instant vaporization via instantaneous phase transition, they would still have to deal with the extreme low temperature left in the spell's wake to deal with.
Most magic that utilizes cold does so by lowering the temperature of an object, creating a corresponding condensation and freezing effect. Ensis Exsequens, on the other hand, causes extreme cold by initiating phase transition by means of the sudden transformation of solids into gases. Thus, cold-based magic is also capable of vaporisation in addition to solidification, though performing this would require a mage on the level of Evangeline.