Souta was checking the things that Raeshka prepared for him. The fruits that could increase his strength, materials for evolution, and one artifact were the things that he requested if he won the battle.
The artifact has an effect that could hide the energy in his body. So if he had the best feram this thing would help him hide the best feram in his body but it couldn't hide the best feram under the watchful eyes of powerful humans. The SSS-rank and Hero rank would be able to detect his best feram. It means that he wouldn't be able to hide his energy in front of Bargan who was at the Hero rank.
There were some exceptions to this rule. If an S-rank or SS-rank sensory type appeared they would be able to sense the best feram in his body.
He also wouldn't be able to use best feram if he was wearing this artifact. The artifact effect would disappear if he uses the best feram.
