Besides securing equipment support and cooperation for the entire Demon Slayer Corps,
Xia Xi naturally would not neglect the followers who had undergone "gruelling training" with him in the Northern Borderlands.
Good things were meant to be shared.
For the dojo in the Northern Borderlands,
the Ninja Village would regularly send its experts there to serve as "professional sparring partners."
Especially when some Demon Slayer Corps members hit a bottleneck in their strength,
they could also practice the Ninja Village's special movement techniques or its mental hypnosis methods
to seek opportunities for something like a breakthrough.
In addition,
the ninjas would also train the swordsmen of the Northern Region in nighttime combat.
Although the swordsmen Xia Xi had guided all possessed excellent physiques and combat skills,
one problem still plagued the vast majority of them.
That was their eyesight.
Most battles against demons took place at night.
This was not modern society with its severe light pollution.
Once they left the major cities,
if they happened to encounter a moonless night, they truly could not see their own hands in front of their faces.
Even with the moon out,
the swordsmen struggled to bring out 100% of their strength.
And these were the Northern Region swordsmen who had nourished themselves with nutritious feasts at Xia Xi's dojo.
For newcomers who went to the Final Selection right after enduring hardships under their Cultivators,
or even veterans who had spent some time slaying demons,
their night vision was often even worse.
When fighting in dim light or even complete darkness,
they relied more on hearing and other vague senses than on eyesight.
They were effectively fighting under debuffs the entire time.
Yet Xia Xi noticed that both Tengen Uzui and the other ninjas in this village
had outstanding night vision.
If demons