Magic Contract

The Magic Contract is a new type of magic developed by Shiroe as part of his Overskill, Contract Art Ceremony.

Overview
The Magic Contract is a document that allows Shiroe to formulate magical spells that did not previously exist in Elder Tale.

The power of a magic contract is based on the rarity of the materials used to create it and the amount of MP required. Rundelhaus Code's contract used Phantasmal-level items of paper from the Fairy King and ink from the Time Dragon's Eye. Due to Shiroe's level 90 skills as a Scribe and his vast MP pool as a Half-Alv Enchanter, he was able to execute the contract to re-write a fundamental law of Elder Tale, thereby creating a form of Global-Scale magic. He keeps this ability a complete secret due to ramifications of such an ability.

Furthermore, all parties must agree to the contract and sign it; if the other party did not fulfill one of the two requisites, the contract will not work.

Return of the Goblin King arc
Rundelhaus Code was mortally wounded during the defense of Choushi Town. Though his body was saved by the healers of his party, his spirit had already left. To save him, Shiroe used Revival Incense to temporarily force his spirit back into his body, then have him sign a Magic Contract crafted with top-quality materials gathered previously when Elder Tale was a game. As a result, Rundelhaus was given the subclass of Adventurer and was revived at the Akiba Cathedral.

Gold of the Kunie arc
After failing to negotiate with Kinjo the first time, Shiroe writes up another magical contract for when he reached Kinjo at the end of the Abyssal Shaft raid. This contract allowed him to use the Kunie's infinite pool of gold to buy up all the unowned zones in Yamato, and then transfer the ownership both that land plus Akiba's important structures to the Kunie clan, rendering them unpurchaseable by any of the Round Table's enemies and releasing them from the duty of maintaining those structures.