Battlemap
Waterdeep Trial Vault
Only one team leaves the waterlogged arena alive.
This Waterdhavian tournament dungeon was built as a brutal elimination crawl, where competing teams must survive lethal chambers, claim relics, and reach the final chamber alive. The lower levels have been weaponized with undead, constructs, and ambushes so the crowd gets a spectacle and the sponsors get survivors worth betting on.
Salt-damp stone, torch smoke, and the copper stink of old blood fill the halls. Crowd cheers and distant horn blasts bleed through magically muffled walls, while the dungeon itself echoes with clanking chains, dripping water, and the scrape of things that should have stayed buried.
☠ Threat
The final threat is Brass Warden Vhal, an arena construct awakened by repeated bloodshed and now driven by a corrupted contest directive: only one team may leave. It commands lesser guardians, exploits the dungeon's secret service passages, and escalates every fight by sealing doors, releasing hazards, and drawing surviving teams into deadly crossfire.
History
The dungeon was built beneath Waterdeep as an elite proving ground for a clandestine grand melee, sanctioned by nobles who wanted danger without street riots. A retired gaoler, an artificer guild, and a secretive temple each added their own chambers, resulting in a maze that mixes prison holds, shrine wards, and kill-boxes designed to test teams before the final prize chamber.
Encounter Table
CRScavenging undead in torn team colors, drawn to the sound of combat and the scent of fresh blood.
A patrol of iron-limbed constructs sent to reset hazards and punish teams that linger too long.
Battle-hardened humanoid survivors who came to win the tournament and now fight like cornered wolves.
A bloated insectoid specimen bred in the maintenance tunnels, loud enough to warn the whole level when it moves.
Rumours & Whispers
They say the dungeon changes routes after each round, as if the walls themselves are taking bets.
A team that prays in the shrine rooms can sometimes get a blessing strong enough to survive the boss.
Someone heard metal footsteps in the prison after the lights went out, even though no guard was posted.
The final prize is real, but the sponsor keeps a secret ledger hidden somewhere below the treasure vault.
A contestant who dies in the crawl may return as one of the next day's guardians.
Quest Hooks
Quest giver: Mistress Velra Dhal, betting-house fixer
A local sponsor hires the party to enter the dungeon crawl and win without exposing the sponsor's cheating ledger.
600 gp and a rare favor from a Waterdhavian patron
Quest giver: Joren Kettle, worried brother of a missing contestant
A previous team never emerged from the prison level, and their token ring is now being sold in the Dock Ward.
250 gp and a family heirloom weapon
Quest giver: Captain Ilthra Vane, watch liaison
The city watch wants proof that someone is using secret passages to poison competitors and rig outcomes.
500 gp plus legal immunity in the arena district
Quest giver: High acolyte Seraphine Thann
An heirloom keyed to the shrine's hidden sigils was stolen and may be the only way to open the vault before the finals.
A blessed uncommon item and 300 gp
Corridor Notes
Bronze plaques set into the walls track team names, kills, and captured sigils, updating by unseen magic after each skirmish.
Shallow runoff channels carry cold seawater across the floor, making some stretches slick and hiding thin pressure plates beneath the surface.
Broken banners from past tournament teams hang from iron rings, each one scorched by different kinds of magic.
Faint applause sometimes rises from nowhere, a glamoured echo from the arena above that can mask footsteps or panic.
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