Reinforcement (強化, Kyōka^?, also translated as Strengthening) is a spell belonging to magecrafts of the Material Transmutation.

Mechanics

Reinforcement is the most difficult magecraft with the purpose of pushing a basis to the utmost limit. It is the foundation of all magecraft that enhance the existence of the target by pouring magical energy, but as no clear expression of how much it can be enhanced is defined, almighty reinforcements are rare.^[1] It is the same as adding something to an object that is already complete, in case of failure the target will receive it as a poison. Success requires a good grasp of the inner structure to fill openings with magical energy. Reinforcing the purpose of existence would be increasing the sharpness of a knife, the nourishment of food, or in the case of a living creature, physical strength and durability.^[1] It is impossible to reinforce something vague. As living things will resist invasion of magical energy, reinforcing someone else is the hardest.^[1]

When applied to the caster’s own body, it can increase their physical abilities and allow them to perform feats of strength and agility beyond their natural capabilities. Human bodies Reinforced with magical energy are capable of physically interacting with spiritual entities, allowing one such as Souichirou Kuzuki to inflict harm on a Servant by means of Medea placing magical energy on his fists.^[2][3][4][5] Strengthening the body for the purpose of combat is a technique employed by many magi who practice Martial Arts, such as Rin Tohsaka,^[6][7] Luviagelita Edelfelt,^[8] and Shirou Emiya,^[9][10][11] and is also used by some of the Holy Church's Executors such as Sister Ilumia.^[12]

Beyond its utility in combat, the most simple forms of bodily Reinforcement can also allow the caster to go without eating or sleeping for several days, a technique which is regularly employed by the Executors.^[13] Kiritsugu Emiya used Reinforcement to enhance his vision, allowing him to see in the dark and at long distances, an application which was also utilized by his adoptive son.

A more advanced technique often used by EMIYA in conjunction with Reinforcement, called Alteration, makes use of the magical energy put into an object via Reinforcement or Structural Analysis to change its structure. By putting this in application, Shirou Emiya is able to create a bow out of the branch of a tree, repair a soccer ball, or change the shape of an object.^[1]

References