On the ground.
Qin Mo descended through the clouds and landed steadily on the shoulder of a Warlord-class Titan, casually flicking away the blood of a group of Chaos Space Marines from the former Legion of the Emperor's Children from the Crone Sword.
Just as the Titan's princeps noticed Qin Mo, the weapon on its right shoulder unleashed a terrifying torrent of energy. The heat and shockwave, enough to vaporize armor, burst out from behind the weapon. Startled, he was about to cease fire, only to find Qin Mo entirely unharmed by the aftermath of the shot.
Then every weapon on the Titan completed its recharge in an instant, while the empty missile bays instantly shifted from empty chambers to launch-ready status.
The princeps watched as the Titan became capable of nearly uninterrupted fire and understood why. Only the Adeptus Mechanicus priest inside the machine, who had been preparing to direct Servitors to reload ammunition, sank into thought.
Qin Mo had merely granted this Titan a small benefit, yet it allowed the Titan to become unstoppable against the enemies it needed to destroy.
The Chaos Knights that had just wiped out a group of Knights before them and attempted to advance were instantly vaporized, along with the traitors from countless renegade legions nearby.
Even the demons suffered devastating blows. The Slaanesh Demons summoned by whatever bastard Vashtorr had fooled were all sent back to the Warp.
As the Titan's advance caused violent swaying, Qin Mo, standing firm on its shoulder, used the HUD map on his visor to see that he was at the very forefront of the battle.
The Titan beneath him annihilated vast numbers of enemies in an instant, but more Daemon Engines, Knights, and armored vehicles belonging to Chaos cultists soon filled the gap.
The Dark Angels