Rex didn't just select the skill; he unleashed it. The moment his finger pressed the conceptual trigger, the world around him seemed to fracture.
The system interface didn't merely vanish; it shattered like glass, sending shards of blue light dissolving into the smoke-choked air.
The agony was unlike anything his Infinite Regeneration had ever encountered. It wasn't the pain of a blade or the burn of fire; it was the sensation of his very essence being forcibly rewritten.
It felt as though molten lead was being poured directly into his marrow, each nerve ending screaming in a chorus of agony that threatened to unravel his consciousness.
'Hold it together,' Rex roared internally, his teeth grinding so hard a molar cracked with a wet snap. 'Don't let it consume you.'
'Command it.'
Through the haze of excruciating pain, he lifted his right hand. His fingers trembled, blood dripping from his split knuckles as he pointed directly at the restrained Leonidas.
