Rowan's existence transformed into a state he could not understand, as his dimensional flesh was compressed to a limit he never thought could be possible.
A Will Holder with a higher dimensional domain may appear to be as large as a universe if they wanted to, but they were not truly that size, and their massive bodies were mostly comprised of higher dimensional energies, Rowan was different, his dimensional flesh was the size of a thousand galaxies and only his Primordial Ouroboros bloodline was strong enough to carry it, so that he could easily compress his body to its present appearance.
To the Tenebris armor, Rowan could as well be made of air as it compressed him to a point many times smaller than an atom.
It was not the pain that destabilized Rowan, he was used to an inconceivable amount of pain, and for him, pain had become almost like another state of being, like walking or breathing, it was already a part of his life.
