Professor DoorMatDoor was tired of nobody finding his jar. It was really bothering him that he himself may have to go searching for it. To search for one's own lost item is the destiny of failures. He hated everyone for their inability to recover a simple jar with a simple magical stone inside of it.
With all his magic he could have located it by now, but that would require effort. It took alot of mental energy to keep the school running. He had to press a button once a day to keep the shields up, but some days he even forgot that. He had no idea if the thing even worked. He pondered in his magic sieve if the darkness had stolen his jar, but misplacing items for decades at a time could also be considered "darkness". He had had the jar for four centuries, and for most of those it was lost in his archive of miscellaneous things.
He waved his hand and one of his slaves walked in. It was Dobrina. She was a child. A child of the caves of magic. The caves of magic were a cover for child labour within the magic realm. Children were useful because they could fit into small spaces and were used to clearly things. They also ate less and took up less space. They had magic but not very much.
"What are you, Dobrina?" DoorMatDoor asked.
"I am not a child. I come from the caves. I am a magical being." She said.
"Exactly. Now that the sponsors have heard that disclaimer, I'd like to thank Braid: Shadow Icons for sponsoring Hogwarts." He said.
Dobrina fetched a glass of sherry for DoorMatDoor. He rewarded her with a button. She was thankful because buttons were a kind of currency amongst the cave children. They could be exchanged for food items and contraband. Dobrina disappeared into the shadows to return to the playpen where the children waited for their next tasks.