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When we arrived at the vast waiting rooms, there was a projection showing what was happening inside the arena, there were various people cheering for the fights to begin. I suppose that this way we can easily see the fights from here, but I still prefer just using two bodies at the same time anyways. By looking at the trainers around, I realized that the majority, if not all of them are using these Monster Jewels. They serve the purpose of storing a monster pet inside and can be fused into any body part of a person.
Some use it on their arms, others in their stomach, chest, face, forehead, anything, some missing an eye put some in their empty eye socket… But when I tried using some in my monster pets, it didn't worked, they broke them all, so I just decided to put them inside my divine realm and summon them outside. I don't think anyone will notice.
Check "The Protagnist's Sister Is Actually the Strongest"!