The second trial was a trial that took place in darkness.
There was no ray of light, only the black moon which released a dark light unto the demon realm.
There are beasts and demons who thrived better under the black moon, and there are also beasts and demons who thrived better under the crimson moon.
Demons usually called the beasts that thrived under the black moon, the Beasts of the Night or the Night Beasts.
And the Blackwind Valley was a place where 99% of the beasts were Night Beasts.
Night Beasts were very similar to assassins in the sense that they used the darkness to stalk and kill their prey.
The second trial was meant to test the capability of the trial candidates in an environment that was suitable for assassins, and in an environment where their enemies were also similar to assassins.
It was meant to see how well some of the candidates could thrive in such an environment, and if they were capable of surviving assassins that were not truly assassins.
