It says that it drops from the Locked crate.
"These crates can contains Guenivere's Egg, Lancelot's egg, Morgana's Egg, Level 76 Arcane Artifacts: Valley Talisman of the Fade, of the Warlock, of the Keep, Elondrian Mythic Belts, Infernal Brimstone vanity weapons, the Infernal Brimstone vanity armor and helmet, and the Gleaming Chrysalis vanity weapon items."
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