"How can you prove these items are yours?"
It's an intriguing question!
William gazed at Nelson with a playful smirk and retorted, "Do I need to prove anything to you?"
Forget the fact that these items originally belonged to him. According to the old Soulmancer rules, possession was determined by who had the greater power.
Clearly, William had the upper hand.
Nelson gritted his teeth, a flicker of indecision in his eyes, and pushed, "Are you truly the owner of this cave?"
William, without responding, approached Mjölnir and with a wave of his hand, stored it into his personal pocket dimension.
Unable to contain his curiosity, Nelson blurted, "Was that Mjölnir?"