All We Fear Is the Unknown

Just as Vizet used the Petrification Curse Order to transform Regulus Black's Locket into a "Soul Guiding Box," Kreacher returned to Lake Heart Island.

"Great Mr. Lovegood, will this jar do?" Kreacher said, balancing a huge transparent jar on his head.

By the light of the Fire Ring, they could see the jar was unusual, faintly giving off a purple glimmer.

"Very pure crystal..." Headmaster Dumbledore took a few steps forward and assessed the jar on Kreacher's head up close. "The craftsmanship is excellent as well..."

He brushed his hand over the jar, and a golden sheen rose around its mouth as dense, fine runes surfaced. "The Protective Magic is also comprehensive... I think it will make an excellent storage container."

"That is good!" Kreacher let out a breath in relief. Even though the jar came with Protective Magic, he was still extremely careful when he set it down, as though he were tending a soft-shelled egg.

Good news also came from Sirius Black and the others. With a churning sound, Sirius Black, holding Regulus's body, had already appeared beneath the lake's surface;

Lupin and Harry supported him from both sides. Clearly, they had already discussed it and could act at any moment to lift Regulus's body out of the water.

Kreacher swiftly unscrewed the jar. "Great Mr. Lovegood, Kreacher only needs to put the lake water inside?"

Vizet nodded. "That's right."

Kreacher hurried into action, directly picking up the jar and walking to the lakeshore to let the lake water flow into it;

This was his third time entering the cave, and he knew there was some kind of magical restriction here. It was likely another trap set by Voldemort: the lake water could only enter a container in this way.

Vizet reviewed his plan and thought of one