A magic scroll was a unique item that could be considered a one-time-use artifact. The scroll was made of a special type of paper that could bear the weight of a magic spell.
The model component required for the spell had to be personally carved by the Magus on the scroll. Moreover, the material components required for said spell also had to be embedded in the scroll through a special method.
The magical scroll used by Kevin contained a rank 2 spell from the School of Invocation. It was a spell so famous and devastating that it had become a symbol for the Magi.
Fireball!
The material components for this spell were the excrement of the fire salamander and fifty grams of sulfur. These components had already been imprinted in the scroll by the Magus beforehand.
All Kevin needed to do was imbue the magical scroll with his mana, perform the required physical component, and finally tear the scroll in half.