Despite the partial slowing of Luotian's speed due to the poison, it was inconsequential as Wo Liming, not being a speed-oriented cultivator, showed no inclination to dodge his impending attack.
Luotian took a moment to retreat before launching back like a kiloton bullet straight toward the Sand King, utilizing one of the features of Underworld Physique—increased body weight with each collected soul.
///// [Underworld Physique] (None) Level 8 (91/10,800) : Multiply the body weight by 500. As long as the skill is still active, bodyweight +40% per every collected soul.
The time inside Sky Locking Array had let him work on the part of that description Sand Guard could not simply make irrelevant: the force behind the next hit.
He had already tested speed and a heavy kick without finding enough power to break through. The collected souls gave him a way to build on the skill that was still active. They were useful for that purpose even when the monsters were far beneath Wing Realm.
