The Accel Spell is a type of Null Magic gains the user a barrier around himself/herself and is able to move at much faster speeds.
While visiting the Kingdom of Mismede, Touya Mochizuki got involved in a duel with the ruler Mismede, Jamukha Blau Mismede. The beastman demonstrated his Accel Spell to Touya, who then surprised him by instantly using it himself.
Strengths and Weaknesses
The Accel Spell allows for quick bursts of speed and can be combined with strengthening magic such as the Boost Spell. However, as mentioned by Jamukha, the downside of the spell is that it consumes huge amounts of mana with each use and will drain the user quickly.