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Tyrants of the Underdark

#223

2016 · 2-4 players · 60min · weight 2.54

port: no portdifficulty: Mediumfit 0.656read deep dive →
Bayes
7.42
Users rated
10,772
Owned
12,199
Wishing
3,603

Core loop (v2)

Spend deck-card influence to recruit minions and power to seize Underdark sites; promote cards out for endgame.

Verb
buy minion, place troop
Decision shape
mixed:combinatorial+spatial
Reward schedule
engine_compounding
ChallengeFantasy
deck_meets_area_controlpromote_to_remove_cardtwo_resource_cardassassinate_opponent_piecesmodular_half_deck_setup

Mechanics (v3 deep)

What you do

On your turn your hands play your entire 5-card hand at once, summing two pools printed on every card: Influence (purple, the buy resource) and Power (red, the fight resource). You then spend those pools, in any order, on a menu of seven actions — recruit a market card with Influence, deploy/move troops on the Underdark map with Power, assassinate enemy troops, or *promote* a card from hand or discard to permanently remove it from your deck for endgame VP. Discard the whole hand, draw 5 fresh, pass.

Core loop

Setup: build the 80-card market by shuffling two 40-card half-decks (Drow, Houses, Demons, Elemental Evil, Aberrations, Undead). Turn: play hand of 5, sum Influence and Power pools, then spend across recruit/deploy/move/assassinate/promote/aspect-ability/place-noble-token. Recruited cards go to discard; assassinated troops go to your Trophy Hall. Promote permanently exiles a card from your circulation, scoring its printed inner-circle VP (1-4) at game end. Endgame triggers when any half-deck pile in the market exhausts, a player places their last troop, or the market deck runs out. Score = sites controlled + city VP tokens + cards in deck (1 each) + cards promoted (printed VP) + trophies (2 VP per assassinated troop) + total-control bonuses.

Decision space

Each turn you partition a single hand of 5 across two non-fungible economies that share no conversion rate: Power for board presence and aggression, Influence for engine growth. The choice space at a typical hand is 8-15 reasonable splits because every action — recruit, deploy, assassinate, promote — competes for the same two pools. The signature tradeoff is spite-vs-economy: 4 Power can deploy onto a contested site (your VP up) or assassinate the leader's troop (their VP down, your trophies up). Strong moves weave the promote and assassinate VP tracks rather than committing to one.

Skill expression

Dominant skills are dual-resource budgeting (how to split a 6-Influence/4-Power hand across multiple actions) and threat assessment (which rival is closest to triggering endgame, and via which trigger). Strong players exploit promote as a primary VP engine rather than a trash mechanic, time their assassinations against Trophy Hall thresholds, and read half-deck pairings (Drow+Demons is a knife fight, Drow+Elemental is an engine race). Memory matters — the market is open but deck composition isn't; tracking your own promote queue separates intermediate from advanced.

Tactile dependency
low — Every component is pure information: cards are values + abilities, the map is a graph, troops are countable tokens. The dual-resource math is exactly the kind of bookkeeping a phone surfaces better than a tabletop — persistent pool counters at the top of the screen update live as cards tap into the play zone.

Theme

Promise

You are a Drow matron mother in the Forgotten Realms Underdark — recruit minions, deploy troops across a graph of dark cities, and assassinate rivals to claim territory below the Sword Coast.

Setting
Fantasy, D&D Forgotten Realms, dark elf, subterranean
Narrative
none — pasted-on theme. The D&D licensing dresses an elegant deckbuilder + area-control hybrid; there is no campaign or story arc, just a pairing of half-decks per game. The flavor is rich (named cities like Menzoberranzan, aspect icons for each Drow faction) but mechanically inert.
Audience
hobbyist Eurogamer, designer-game-aficionado
Art direction

Forgotten Realms cavern aesthetic — deep violets and obsidian blacks on the board, glowing faerzress mushroom-light, drow purple-grey skin tones on card portraits, demonic crimson accents. Card art credited to multiple WotC fantasy illustrators in painted-realist style. Recognizably D&D — same visual genus as a Magic: the Gathering set, distinct from Eurogame illustration.

Translation potential

Closest mobile genre
tactics RPG
Live-service potential
medium
Digital meta-layer ideas
  1. Underdark Conquest campaign: 7-9 maps with escalating site count and AI rival count, randomized half-deck pairing per map so the player sees most pairings across a run; final map is a named boss house (Baenre, Do'Urden, Vandree) with a unique passive
  2. Persistent House Perks drafted between maps: 1-of-3 permanent passives like '+1 starting troop', 'first promote each game gives +1 VP', 'noble tokens cost 1 less Power'
  3. Matron Mother run-flavor pick at run start: Lolth doubles assassination VP, Vhaeraun makes every 3rd recruit half-price, Eilistraee boosts promote VP by 50%
  4. Daily Underdark: fixed map + fixed pairing + fixed AI rivals + leaderboard by VP margin
  5. Visible Grudge meters per AI rival to replace the missing table-talk deterrence metagame — implicit human treaties become legible UI escalation thresholds

BGG tags

Mechanisms
Area Majority / InfluenceConnectionsDeck, Bag, and Pool BuildingDelayed PurchaseOpen DraftingTake ThatVariable Set-upZone of Control
Categories
FantasyFighting