Originally, under the pressure of the Blood-Erosion Alligator Dragon, a Fourth Rank Lower Class, most monsters were already greatly suppressed; however, now that the Insectoid Titan and the Mother Worm joined in simultaneously, the already-oppressed Evolved Kind monsters were mostly kneeling on the ground.
This was not any special skill, but a mere manifestation of sheer willpower. The stronger one's power, the more terrifying this influence would become on higher-grade monsters and Angel Envoys.
"Roar"
The Salamander Dragon, the Blue Stone Bull Python, and the Dragon Spider all burst into enraged roars at the same time, trying to resist the pressure from Su Han's three Angel Envoys with the sound of their roars.
However, even though they were leaders within their respective monster groups, such resistance seemed rather insignificant under such a great disparity in levels.
Mental Shock
