Stronghold buildings
Halls
Village Hall
Town Hall
City Hall
Capitol
Fortifications
Fort
Citadel
Castle
Common
Blacksmith
Mage Guild
Marketplace
Resource Silo
Tavern
Specific
Ballista Yard
Freelancer's Guild
Mess Hall
Escape Tunnel
Hall of Valhalla
Warlords' Monument
Dwellings
Goblin Barracks
Wolf Pen
Orc Tower
Ogre Fort
Cliff Nest
Cyclops Cave
Behemoth Lair
Towns
Castle Rampart Tower
Inferno Necropolis Dungeon
Stronghold Fortress Conflux
Cove

Building cost: 2000 Gold 5 Wood 5 Ore.
Buildings required: Fort.

Escape Tunnel is a Stronghold building which allows a garrison hero to retreat from defending against a siege. However, it does not allow the hero to surrender.