Gary Smith roughly organized the gains from his journey.
The first was a significant increase in skill proficiency. Indeed, fighting was the fastest way to level up, especially with the ungraded skill, spider silk. Its proficiency reached the Mastery Level, at 98%, was just a step away from the Perfect level.
The second was a huge amount of resources. There was no need to mention the low-level demon materials, most of which were generic. He prepared to exchange the loot obtained during the Limb Demon raid, along with those, for money, which would serve as a reward for Evelyn Walker.
The mysterious Holy Light, unsurprisingly, should be her handiwork and had greatly helped him.
As for the most important materials, the Thousand-Faced Demon and Savage Ant, one was made into the Evolutionary Secret Food, and the other, merely a corpse, was all devoured by Mousie.