Ordinary small-caliber firearms couldn't even break through the Death Qi around Lu Yuan. The moment a bullet entered the Death Qi, its kinetic energy was immediately reduced. Even if an occasional bullet managed to hit Lu Yuan, it was as harmless as being lightly pelted with a small stone.
The same was true for small-caliber energy guns. As the energy beam from an energy gun entered the range of the Death Qi, it was quickly dissipated by the Death Qi, greatly reducing its power.
The Lv 8 Death Qi, when gathered, was already enough to block most damage from thermal weapons. Not to mention that Lu Yuan also had a layer of Nether Clothing inside.
Netherworld Clothing was a specialized defense skill. Lu Yuan was currently only Lv 1, but his defensive power was still quite considerable. At least in the Imaginary Enemy scenario, neither Zhou Ling nor Gao Qing, the two Huang Bear Leaders, possessed any means to break his Lv 1 Netherworld Clothing.