Breakthrough
The best part about the Mighty Roar Flash Blast technique that he had gotten from G'ak'arkan Tribe, as well as the Sonic Bullet technique was that he could control the kind of damage that he inflicted on the ceiling of the dungeon.
Thus he could control the projectile to ensure that the resulting crater was ten meters wide.
He found it a shame that he couldn't use tier four Transverse Resonance, where he overlapped four sonic projectiles in constructive resonance. Unfortunately, that required a distance that was far in excess of ten meters.
THWOOM THWOOM!
BAM!
He kept striking at the ceiling, forming a deeper crater with each attack. The hot air pipe definitely helped, even if it wasn't too significant. The heat made sure that the damage was more localized whereas impacts could spread unscrupulously