Shaun alone had a hard time killing a tenth-tier Lord. He needed to cooperate with the other four.
The mutant orange cat also didn't unleash its full potential but kept delaying the two tenth-tier Lords.
Even if both the undead and the cat fought at their maximum capacity, it was still challenging to instantly kill tenth-tier Lords. If the enemy chose to retreat, they wouldn't be able to stop them.
The battle between these four powerful creatures caused great disturbances, and there were no other creatures nearby.
Otherwise, the shockwaves from their battles alone would easily tear apart Lord-level beings.
While Shaun struggled to kill the tenth-tier Lord, he had no trouble defending himself. He activated the "Heavy Defense" skill, instantly boosting his defensive capabilities. He could easily withstand the attacks from the mutant tree.