When Sonus's fatigue draws to a high, Sonus discards his jacket in order to boost mobility. By this time, his inertia ability has worn off due to fatique and he begins to show bodily signs of harm. Despite this, descarding the jacket proves to be his trump card. His mobility is increased, and his attacks are much speedier, able to move his limbs even faster than sound in short bursts of rage. As an added effect, Sonus gains another level of unpredicatability. He begins uttering truly diabolical things, and maintains a crooked smile; referring it as his "innocence".
This unpredictability and mobility boost allows him to unleash his Desperate Attacks.

Desperate Attack List:

Kamikaze's Wind- Headbutt an opponent recklessly, pushing forward and overpowering with aid of wind.

The Bramble's Thorn- Relentlessly pinball opponent around in the air before slamming them down headfirst. (Attack can climb to 80 feet in the air before end)

Air Glyph: "Hurricane Catalina"- Form glyph in the ground and stamp it flat. Muscle and mass can be pushed to utmost limits with the aid of wind. Power increases tenfold. (Marked by nigh-instant muscle growth in body mass.) Sonus crushes opponents flat with a body that rivals the villain; Stain.