Vault Below the Stygian Flagstone

Beneath a collapsed corridor in the lower dungeon you pry up a mismatched flagstone and find a shallow cache. The chest beneath contains coin pouches and a few carefully wrapped gems, clearly placed there by someone who intended to return. Alongside normal coinage are higher-value finds: a shortsword tempered with minor enchantment, a Wand of Magic Missiles with some charges remaining, and a Bag of Holding that explains how the stash was transported. A sealed spell scroll and a Potion of Greater Healing point to a party that expected trouble. Mixed among the trade goods are two uncommon curiosities: a vial of phosphorescent Dungeon-Bloom Sap useful to alchemists and crafters, and an engraved iron key that thrums near old doors. The hoard is modest but useful to a 5th-level party: funds for supplies, a reliable magic weapon for a frontline fighter, healing when wounds run deep, and tools that open new exploration options in the dungeon's depths.