Demon Men, as a matter of common principle, are special existences transformed from human to neither human nor demon state by the Demons above the Big Monster rank using their own bloodline power.
Their strength often temporarily increases due to demonic power, but this also completely cuts off their ability to cultivate.
This is why the Demon Slayer Department prohibits Demon Men, even at the initial ambiguous stage of the department's attitude towards the Demon Clan, the stance on Demon Men has never changed.
Kill without mercy.
Normally, Cultivators can also absorb Demon Cores, but unless there is a special Secret Technique with a very low conversion rate, ordinary Cultivators will not commit such a wasteful act.
For Su Chengyu, a quarter of his bloodline is from the Demon Bloodline, which makes absorbing a Demon Core much more convenient than for ordinary Cultivators; however, Su Chengyu would not commit such a wasteful act unless under current circumstances.
