Scarlet Citadel for 5th Edition: Essentials:

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• Playing time: -- minutes
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Scarlet Citadel for 5th Edition: - Rules of Play says:

Once a functional fortress where wizards honed their eldritch craft, little now remains of the Scarlet Citadel – on the surface. The place now has a sinister and deadly reputation among adventurers and lorekeepers, and for good reason. The dungeon’s well-trod stairs have seen few return from their journeys below.

Here, deep underground, dwarven mercenaries once bred their owlbears for war, sorcerers from the White Forest practiced their arts, and strange cults from other realms drew from mysterious nodes of power. Ancient treasures and secrets are still scattered everywhere. Malevolent creatures spin shadowy webs, enchant foul magics, and summon forth dark gods.