Here's the translation adhering to your guidelines:
Joshua Hess sneered incessantly; as a Martial Marquis, he had absolute confidence.
"Bang!"
The collision of their palms instantly ignited flashes of brilliance!
Ethan Smith hurriedly waved his hands, shielding the surrounding alchemists.
*This was the clash of Martial Marquises, a power unimaginable!*
"How is this possible?!"
Upon feeling the Pavilion Master's strength, Joshua Hess's expression changed dramatically!
He staggered back dozens of steps, his palms throbbing with pain!
Joshua Hess's face grew grim, and a hint of unease floated to the surface of his mind.
"You... you've stepped into the Martial Marquis Realm?" Joshua Hess stared fixedly at the Pavilion Master.
The Pavilion Master replied indifferently, "What do you think?"
"You!" Joshua Hess was so furious he almost spat out blood!