Accordingly to Archer the Store was a great boost on his evolution. There was a lot of information he had to analyze. First was the prices and what they could do for him. Beyond that he learnt that more things were hidden because of his knowledge upon his benefactors.
There was a simple item on it that had the ability to reveal someone's name. Like he did it with Nathaniel. This was the most expensive item which started at the ten thousand. But it had the most crucial value as it was responsible to reveal all that creature's related content on the Store. Which was the following ones.
[Fire Angel Physiology (S-Rank Ability): Your body starts to become a emboidment of holy powers and transcend into a full fledge Fire Angel. The powers only shows up after the completion.]
[Prana Sensitivity (A-Rank Ability): Your body become more sensible towards Prana and this boosts your Prana regeneration. This increases over time as Angels become more stronger and their Prana pool increases.]