Less than two days after Roy successfully finished brewing the potion, Dumbledore, who had been all but impossible to find lately, sought him out.
On the afternoon of a day off, Roy, having just completed a major task, was in the Special Operations Office discussing the next lessons for the younger students with Cedric, Connor, and the others when Fawkes suddenly appeared in the lounge with a letter from Dumbledore.
The moment Roy saw Fawkes arrive, he knew without even thinking what Dumbledore wanted him for.
Fawkes dropped Dumbledore's handwritten note into Roy's hand, then, seemingly tired of delivering letters, pecked at Roy's hair twice before vanishing from the Special Operations Office's lounge in a flash of fire.
Roy opened the note and read it, then immediately brushed off his backside and rose from his chair. Leaving them with a few words, he walked straight out of the Special Operations Office.
"What intricate alchemy-"
Ten minutes later, in the Headmaster's Office, Roy sat across from Dumbledore, looking at the mithril and diamond necklace Dumbledore had placed on his desk. Filled with curiosity, he picked it up and brought it closer to examine it.
Though this was not his first close look at the mithril necklace crafted by Nicolas Flamel, Roy was still amazed by the painstaking perfection of Flamel's alchemical craftsmanship.
The necklace, made of interlocking, overlapping rings of mithril and pure gold, was covered in all manner of runic inscriptions. With his current level of alchemical skill, Roy could barely make out the general meaning of its runic patterns.
Dumbledore reached across the desk and pointed at the layers of runic arrays on the necklace as he explained to Roy exactly how to use it.
"The necklace Nicolas Flamel made was designed specifically for this protective magic. Its eighteen