The first trial was self-explanatory.
Damien's flesh and bones were sundered and burned until they couldn't be burned anymore.
And then they were burned some more.
Transcendent Regeneration kept him alive and his iron wall mentality didn't submit to such little pain, making this trial easy to pass.
It was even mildly enjoyable.
Damien enjoyed "sensation" a lot. The tactile sensation of pain made him feel like he was putting in effort to gain the strength he had, changing his view of it into something positive.
Even during battle, while getting injured was extremely detrimental, it only made Damien enjoy the fight more.
The battle maniac tendencies he had as a teenager had been thoroughly suppressed in the vicissitude of time, but they were still present somewhere in his heart.
He only really felt that insane, almost orgasmic drive for pain and death in training situations like this where he was stimulated to the max.
