Atmospheric Blast Magic

Instantaneous Destruction: Following the rules for range, spells can be detonated anywhere within that area from the target according to their level. Meaning that if Yoshikawa is standing fifteen meters away from an enemy he can detonate the spell right next to their face because they are within range of his magic's spells. Luckily a small baseball-sized bright light forms in the area he is targeting allowing opponents a chance to react before it detonates. His power is hard to avoid in the daytime, which is odd for an assassination magic. (While traveling to its destination it is invisible.)

Assassination Magic: Due to how it is used it can be used to get the jump on unsuspecting foes though there are ways to counter being hit by the technique though it isn't easy and due to the unpredictable nature of his magic he can set up traps for his opponents, especially those who are mid-air and can not fly. He has a distinct upper hand against opponents who aren't aware he is there.

Silent: All explosions and implosions generated by this magic are completely silent due to trapping in side vibrations at their epicenter. Meaning that the magic could be used for assassination of targets without alerting others, especially if the user manages to get a strong enough spell for head shot purposes. [Note: Even if the light is eaten before the detonation, it will not cease the detonation from occurring. The light is simply a cause of the explosion or implosion occurring.]

Oxygen Reliance: If there is a lack of oxygen in a given area he is targeting nothing happens, meaning that air space magic can be used to completely negate his ability to use blast magic. Smoke in any given area also hinders his ability to use his magic properly.

Ice Disability: Due to being of the wind element he is unable to actively combat against Ice properly, his explosions and implosions will not split ice and will at most put small cracks into it unless he generates a spell that is a full rank-higher than the ice technique that is used on him.

Offense Limitation: He has none of the benefits afforded by other magics and can only generate different types of explosions and implosions with his magic. He has no defensive or supplementary capabilities with this power as the explosions and implosions do not generate enough force to propel him forward and are only used to crush objects that are within their range.

Limited A.O.E Spells lack the ability to have an area of effect larger than five meters meaning that stronger spells are similar in size to the weaker spells though they can travel further in distance than the weaker spells can. Due to their limited area of effect the spells themselves are less threatening on paper compared to even D-rank spells. This is to balance the first strength. (Meaning that damage does not happen in the ENTIRETY of the aoe area, rather it happens in a specific location WITHIN that area. A slice of the pie opposed to the entire pie.)