Under-City

Not to be confused with the Under-City building.

Under-Cities are a special settlement type available to Skaven factions which can be established secretly underneath settlements owned by other factions. They are similar to the Pirate Coves of the Vampire Coast.

Under-Cities were added in the Doomsayers Update, due to popular community demand.

How they work

• Under-Cities can be established by choosing the Expand Under-Empire settlement option after defeating a settlement's garrison.
• Additionally, Warlock Engineers can establish Under-Cities as a hero action, without needing a battle. There will be a 10-turn cooldown before any engineer can perform this action again, and the gold cost will increase with each under-city established in this manner. This includes the under-city with Warlock Laboratory established by a DOOOOM! Engineer.
• Under-Cities will be destroyed by razing the settlement entirely.
• Under-Cities have their own buildings available for construction, separate to regular Skaven buildings. See Buildings section below.
• Under-Cities have no garrison.

Discoverability

• Under-Cities and the buildings they construct are invisible to all other factions as long as they are not discovered.
• Most buildings in an Under-City increase the discoverability rating. Buildings in the Concealment chain decrease discoverability.
• Certain heroes have the Discover Under-city passive ability, which will increase discoverability when such heroes are present in the region. Conversely, the under-city owner can deploy warlock engineers, which have the Conceal Under-city passive ability, in the region to decrease discoverability.
• The higher the discoverability, the more likely the Under-City is to be discovered.
• The under-city will be discovered when discoverability reaches 100. The settlement owner can then spend gold to destroy the under-city.

Buildings list

Annexation - Warren

Name/Tier	Cost/ Construct Time	Upkeep (per turn)	Discoverability	Effects
Burrows I	1000 G 1 Turn	None	+10	Upgradable into Dens Skaven Corruption +0.25 in adjacent provinces Player's local armies Campaign Movement +10% (when starting turn in region) Leadership +2 (when attacking) Replenishment rate +10% The Menace Below +2 uses
Dens II	2000 G 2 Turns	None	+20	Upgradable into Lairs Skaven Corruption +0.25 in adjacent provinces Player's local armies Campaign Movement +20% (when starting turn in region) Leadership +4 (when attacking) Replenishment rate +15% The Menace Below +3 uses
Lairs III	3000 G 3 Turns	None	+30	Upgradable into Subterranean Hideout Skaven Corruption +0.25 in adjacent provinces Player's local armies Campaign Movement +30% (when starting turn in region) Leadership +6 (when attacking) Replenishment rate +20% The Menace Below +4 uses Skaven Corruption +0.25 in adjacent provinces
Subterranean Hideout IV	4000 G 4 Turns	None	+40	Upgradable into Under-Keep Skaven Corruption +0.25 in adjacent provinces Player's local armies Campaign Movement +40% (when starting turn in region) Leadership +8 (when attacking) Replenishment rate +25% The Menace Below +5 uses Skaven Corruption +0.25 in adjacent provinces Skaven Corruption +0.25 in adjacent provinces
Under-Keep V	5000 G 5 Turns	None	+50	Skaven Corruption +0.25 in adjacent provinces Player's local armies Campaign Movement +50% (when starting turn in region) Leadership +10 (when attacking) Replenishment rate +30% The Menace Below +6 uses Skaven Corruption +0.25 in adjacent provinces

Annexation - Stronghold

Name/ Tier	Cost/ Construct Time	Upkeep (per turn)	Discoverability	Effects
Underpass I	1000 G 1 Turn	None	+10	Upgradable into Underway Junction Skaven Corruption +0.25 in adjacent provinces Player's local characters Hero Action success chance +10% Player's local armies Campaign Movement +10% (when starting turn in region) Attribute: Vanguard Deployment
Underway Junction II	2000 G 2 Turn	None	+20	Upgradable into Underway Croassroads Skaven Corruption +0.25 in adjacent provinces Player's local armies Campaign Movement +20% (when starting turn in region) Hero action success chance +20% Attibute Vanguard Deployment
Underway Crossroad III	3000 G 3 Turn	None	+30	Upgradable into Underway Hub Skaven Corruption +0.25 in adjacent provinces Player's local armies Enables lighting strike battles when reinforcements are present Campaign Movement +30% (when starting turn in region) Hero action success chance +20% Attibute Vanguard Deployment
Underway Hub IV	4000 G 4 Turn	None	+40	Upgradable into Underway Nexus Skaven Corruption +0.25 in adjacent provinces Player's local armies Enables lighting strike battles when reinforcements are present Campaign Movement +40% (when starting turn in region) Hero action success chance +30% Attibute Vanguard Deployment
Underway Nexus V	5000 G 5 Turn	None	+50	Skaven Corruption +0.25 in adjacent provinces

Ruination

Name/ Tier	Cost/ Construct Time	Upkeep (per turn)	Discoverability	Effects
Rat King I	1000 G 1 Turn	-5 Food	+140	Skaven Corruption +0.25 Upgradable into The Vermintide
The Vermintide V	4000 G 5 Turns	-5 Food	+140	Upon Completion, the Under-city is destroyed and a Vermintide army under the player's control is spawned at the settlement. War will be declared between the player and the settlement owner if they are not already at war.
Makeshift Workshop I	1000 G 1 Turn	-500 G -2 Food	+160	Available to Clan Skryre only Skaven Corruption +0.25 Upgradeable into Doomsphere

• Doomsphere: razes the settlement above after 15 turns of building. (Clan Skryre exclusive (Prophet and the Warlock DLC))
• Grand Plague Cauldron: An unending plague will be unleashed upon building completion, blighting all above until the Under-City is destroyed. (Clan Pestilens exclusive)

Concealment

Name	Tier	Cost/ Construct Time	Upkeep (per turn)	Discoverability	Effects
Murder Holes	I	1500 G 1 Turn	-100 G	-20	Skaven Corruption +0.25
Kill-Perches	III	3500 G 3 Turns	-200 G	-40	Skaven Corruption +0.25
Deeper Tunnels	II	2000 G 3 Turns		-40	Skaven Corruption +0.25 Visibility over the region is lose

Food

20

Name	Tier	Cost/ Construct Time	Food generated	Discoverability	Effects
Scavenger Raiders	I	1000 G 1 Turn	1	+20	Skaven Corruption +0.25
Scavenger Horde	III	3000 G 3 Turns	3	+40	Skaven Corruption +0.25
Raiding Camp	IV	4000 G 4 Turns	2	+80	Skaven Corruption +0.25 Income generated +100 Income gained from local settlement's income 10%

Money

Name	Tier	Cost/ Construct Time	Food consumed	Discoverability	Effect
Warp-Token Stash	I	1000 G 1 Turn	-1	+20	Skaven Corruption +0.25 Income generated 200
Warp-Token Mint	III	3000 G 3 Turns	-2	+40	Skaven Corruption +0.25 Income generated 400
Thieves' Hidey-Holes	I	1000 G 1 Turn	-1	+20	Skaven Corruption +0.25 Income gained from local settlement's income 20%
Rat-Keteers	III	3000 G 3 Turns	-2	+40	Skaven Corruption +0.25 Income gained from local settlement's income 30%
Ratkin Mafia	IV	4000 G 4 Turns	-2	+80	Skaven Corruption +0.25 Income gained from local settlement's income 50%

Mining

See also

• Pirate Cove, Vampire Coast equivalent
• Trickster Cult, Tzeentch equivalent