Finding a treasury chest

Inside a small house nearby two teenage boys are staring at a treasury chests for a long time.

"Hey, where did you find this chest?"  said Vaan

"You may not believe it, but I found it in the river nearby the village." responded Sky

"You know this an ultimate treasure chest? I hear someone saying that only fifty of those chests exists," said Vaan

"I don't know how it get there, maybe someone throws it in the river because there is something wrong with this chest." 

"It's cursed, don't open it!" said Vaan

"Fool! I can't open it even if I  want do. I don't have those stones."

"But I got one!" said Vaan

"Wait, how do you get this?"

"I stole it from a duelist. That guy is such a dumbass. He left his stones inside a locker when he is in a bath house. I saw it and picklock the locker. But the strange thing he only left the blue stone inside."

"I don't think we can open with this stone unless it's a high ranked one."

"Well, let's check it!"

"Status bar appear!"

A holographic screen appears in front of those two.

StatusAliveNameRichard DesireeGenderMaleRank8WeaponMefaris (Legendary)

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ArmorHeavens Engage(Ultimate)Ultimate abilityNone

"A single digit duelist? We are dead meat if he find us!" said Sky

"Either this stone belongs to him or it was stolen by that idiot." 

"If we return to him, he will think we stole it. If we don't return it he will lose his right as duelist."

"He still get his red stone, he won't lose his duelist status. He can't gain more ranks even If he win." said Vaan

"I don't think this is the right thing to do.  Just give this stone to the duelist association.They will give him the stone back" said Sky

"Yeah! I will return back."

"Just kidding! Vaan runs towards the chest and touches it with blue stone and said "Release seal!"

A blue light is released from the stone and it shatters in pieces. The seal disappeared from the treasure chests

"What the fuck are you doing?" 

 "It's too late now, aren't you curious what's inside this chest? It's your chest just open it.  

 [ I don't care anymore, I'm going open it!]

He nervously touches the chest and opens it. A white flash appeared in front of his eyes and he falls unconscious a moment later.