# D&D Lords of Waterdeep: Undermountain expansion

Summer DB entity ID: b723fcf6\-18ce\-4c28\-9573\-34a0e6c2081a

Steam App ID: 645670

The Undermountain expansion gives players the chance to explore Undermountain, a vast and multileveled dungeon beneath Mount Waterdeep that once served the crazed wizard Halaster as a site for magical experiments\. In this labyrinthine with few refuges for weary adventurers, players can enter new quests to discover rumored wealth but must brave the mysteries and monsters beneath the City of Splendors\.     With three new Lord cards including the Wizard Halaster Black Cloak, clever dandy Danilo Thann, and Halaster’s apprentice Trobirand, players can test their skills on four new quests and new intrigue cards\. An expanded gameboard with three new buildings and an extra agent, as well as a handful of new buildings for purchase, keep the gameplay challenging\.

## Game information

- Type: dlc

- Developer: Playdek, Inc\.

- Publisher: Playdek, Inc\.

- Release date: Sep 1, 2017

- Coming soon: false

- Free to play: false

- Parent Steam app: 644390

- Genres: Strategy

- Categories: Single\-player, Multi\-player, Online PvP, Shared/Split Screen PvP, Shared/Split Screen, Cross\-Platform Multiplayer, Downloadable Content, Steam Achievements, In\-App Purchases, Stats, Family Sharing

- Platforms: windows, mac

- Website: Not collected

- Screenshots: https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/645670/ss\_85f29825fd629f2e23129f2be9781826a141e486\.1920x1080\.jpg?t=1504295551, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/645670/ss\_d8cbea0c0b3c586ec264ccda7b767b973422fb31\.1920x1080\.jpg?t=1504295551, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/645670/ss\_b71ddc107003f0d53576d75d850dcde75d6c9c2c\.1920x1080\.jpg?t=1504295551, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/645670/ss\_e92d358d4b7821fd6bf9004e9bff64a1f5af6c67\.1920x1080\.jpg?t=1504295551, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/645670/ss\_b44a047aa5e8edf64f2573f7fbc0b41114572bdb\.1920x1080\.jpg?t=1504295551

- Price: 199 minor units USD; discount 0%

- Price country: US

## Observed metrics

- Current players: Not collected

- Steam review count: 15

- Steam positive reviews: 11

- Steam negative reviews: 4

- Steam positive percentage: 73.33333333333333%

- Summer DB rating: No native votes

Review filters: \{"language":"all","review\_type":"all","purchase\_type":"all","filter\_offtopic\_activity":0\}

## Player history

[Seven-day chart data as Markdown](/api/v1/entities/b723fcf6-18ce-4c28-9573-34a0e6c2081a/player-metrics?days=7&format=markdown) · [JSON](/api/v1/entities/b723fcf6-18ce-4c28-9573-34a0e6c2081a/player-metrics?days=7)

Chart values are hourly observed maxima. The sampled 24-hour peak and missing intervals carry explicit coverage; history before collection is unknown.

## Sources and freshness

- Catalog membership: store\_catalog

- Catalog observed: 2026\-09\-28T16:58:32\.455488\+00:00

- Details observed: 2026\-09\-22T22:55:08\.990027\+00:00

- Player count observed: Not collected

- Reviews observed: 2026\-09\-22T22:55:10\.323189\+00:00

Full provenance: \{"urls":\{"price":"https://store\.steampowered\.com/app/645670/","catalog":"https://api\.steampowered\.com/IStoreService/GetAppList/v1/","details":"https://store\.steampowered\.com/app/645670/","players":null,"reviews":"https://store\.steampowered\.com/appreviews/645670"\},"price":"2026\-09\-22T22:55:08\.990027\+00:00","source":"steam","catalog":"2026\-09\-28T16:58:32\.455488\+00:00","country":"US","details":"2026\-09\-22T22:55:08\.990027\+00:00","players":null,"reviews":"2026\-09\-22T22:55:10\.323189\+00:00","language":"en","editorial":null,"membership":"store\_catalog","observations":\{"price":"8f10b772\-7a6c\-4314\-ac22\-547a269a3827","catalog":"c1ae9638\-70c3\-403f\-a829\-00d6a5926998","details":"1260d088\-ce81\-4ea4\-b2d1\-39138f5ecd8e","players":null,"reviews":"bff776e5\-0af6\-4ffd\-8c28\-f2045cc99ad5"\},"reviewFilters":\{"language":"all","review\_type":"all","purchase\_type":"all","filter\_offtopic\_activity":0\}\}

Native rating methodology: \{"count":0,"average":null,"entityId":"b723fcf6\-18ce\-4c28\-9573\-34a0e6c2081a","revision":0,"observedAt":null,"methodology":"arithmetic\-v1","distribution":\[0,0,0,0,0,0,0,0,0,0\]\}

Steam reviews are not Summer DB votes. Missing data is not zero. Player counts are observations, not historical peaks. A supplemental record does not establish that a game was delisted.

[Steam store](https://store.steampowered.com/app/645670/) · [JSON](/api/v1/games/b723fcf6-18ce-4c28-9573-34a0e6c2081a)