Riggs is the last of the mechanical monks, guarding the temple of the God of Machines with absolute logic.
The Flesh Cultists taint the sacred gears with corrupted blood, creating twisted creations of flesh and metal.
Riggs first experiences "hesitation" when he defies logic to protect human refugees.
The leader of the cult revealed the truth: The core of the God of All Machines is actually living flesh and blood from ancient biological civilizations.
Riggs finally chose to fuse the corrupted blood and use self-sacrifice to complete the ultimate purification of logic and chaos.