In troubled times, "human mandrills" appear.
In peaceful times, "mandrills" may just be evil people.
But in that era, the ghosts who burned, killed, looted, took pleasure in killing, and committed atrocities against humanity had long lost their humanity and became walking "demons."
In the eyes of ascetics, the entire world is a huge Shura field, full of "mandrills" waiting to be executed.
Killing ghosts and mandrills will gain merit.
Ordinary Taoist priests go down the mountain to kill the enemy, which is chivalrous for the country and the people.
But our protagonist has an additional layer of spiritual purpose on top of chivalry.
Every time you kill a "human mandrill" that is guilty of sin, you are doing justice for heaven and you can gain "merit and virtue from heaven."