Synchronized Linear Fusion (シンクロライナー・フュージョン), also known as Synchronized Linear Nuclear Fusion is a Strategic-Class Magic that can create a large scale thermonuclear explosion. It's a magic which is the only successful example of a large-scale thermonuclear explosion in the world, and no one else can reproduce this technique aside from Miguel Diaz. 
When casted, a high density hydrogen plasma cloud is accelerated in a distance of several kilometers to several tens of kilometers and collides in the air over the point of attack causing a fusion reaction. The magic's aim is to destroy the target area with shock-waves. In order to reach the power of Strategic-Class, it's necessary to collide a myriad of protons constituting a plasma cloud almost simultaneously in a head-on collision. The effect is the same as a hydrogen bomb, and the destructive power is inversely proportional to the cube of the distance from the hypo-center.