Last Asylum Plague Buildings

Published: 2026-10-25

Last Asylum: Plague has 46 buildings. 32 of them upgrade to level 30 and 14 are built once. The Sanctuary caps every other building, so it comes first, with the Research Lab and Training Grounds right behind it. The tables list each building with its Sanctuary unlock level, build limit and full upgrade cost.

All Buildings by Group

Every building below uses its in-game English name. The Unlocks at column is the Sanctuary level where you can place the first copy, and Max built is the highest number of copies the base game allows. Upgradable buildings start at level 1 and stop at level 30, the same cap as the Sanctuary. The second research building is called 2nd Workbench in the building list and 2nd Lab in the research screen.

Core Buildings

Sanctuary is available from the start. Builder's Hut opens at Sanctuary 3, the Research Lab at 7 and the 2nd Workbench at 9. These four buildings decide how fast the rest of the base grows.

Economy and Storage Buildings

Farm, Lumberyard and Herb Garden make Grain, Timber and Herb every hour. Granary, Lumber Depot and Herb Storage do not raise your stock. They protect part of it from plunder. The fourth Herb Garden needs Sanctuary 19, much later than the fourth Farm at Sanctuary 12.

Military Buildings

Training Grounds, Barracks and Infirmary grow the army. Walls, Watchtower and Scout Squad handle defense and scouting, and each of the four Squad buildings is one more march queue. Squad 3 comes last, at Sanctuary 20. The three faction statues raise the counter effect of their heroes.

Gear and Raven Buildings

Gear Workshop crafts hero gear, Smelting Workshop makes Gearstones and Weaving Workshop makes gear crafting materials. Both production workshops allow 5 copies. The Raven Workshop opens late, at Sanctuary 15. The gear page and the Raven page cover how to use their output.

Hero and Event Buildings

Tavern is the only upgradable building here, and it recruits heroes. Falcon Tower, Arena and Black Ops open game modes. Residence is ready at the start, and the Temple opens at Sanctuary level 7. The Hall of Honor opens at Sanctuary level 15 and holds heroes at full stars, see Hall of Honor honor levels and bonuses. Most of these buildings stay at level 1 for the whole game.

Alliance Buildings

Alliance Hall unlocks at Sanctuary 6, and its first level needs Falcon Tower level 1. The two stables open together at Sanctuary 11. The alliance page explains what the hall does for your help timers.

Building Limits

Some buildings allow several copies, and each extra copy opens at its own Sanctuary level. This table shows the Sanctuary level for the first, second, third, fourth and fifth copy. Research can raise a few limits by one: Additional Farmland at Research Lab 9, Extra Lumberyard at Research Lab 12, Extra Training Grounds at Research Lab 13, Extra Herb Garden at Research Lab 15, Extra Infirmaries at Research Lab 21, Extra Barracks at Research Lab 23. The research page shows where each node sits in the tree.

Building Requirements

Every building level needs a Sanctuary of the same level or higher, so a level 15 building needs Sanctuary 15. A few first levels also ask for another building: Training Grounds needs Barracks level 1, Squad 1 needs Explorer's Camp level 1, Alliance Hall needs Falcon Tower level 1, and Arena needs Squad 1 level 1. The first levels of Granary, Lumber Depot and Herb Storage need the matching Farm, Lumberyard or Herb Garden at level 2 to 4.

The Sanctuary itself asks for specific buildings at 27 of its 29 upgrade steps, from the three storage buildings at level 4 to a long list at level 30 that ends with Antitoxin Workshop 15. Count how often each building appears: Research Lab 20 times, Training Grounds 9, Walls 6, Alliance Hall 6 and Warrior Statue 5. The Sanctuary requirements table lists the exact level for every step.

Building Priority

The order below follows two things: what the Sanctuary asks for, and what each building gives back. It matches the advice of several progression guides, which all put the Sanctuary and the Research Lab first. The upgrade guide places this list inside the full account route.

1. Sanctuary. It limits the level of every other building and sets the hero level cap. It gives 384.3K might at level 30 on its own, more than any other building.
2. Research Lab. 20 of the 29 Sanctuary upgrades ask for it, and from Sanctuary 12 on it must stay exactly one level below the target. It also makes every research faster, up to 15.1% at level 30.
3. Builder's Hut. The Sanctuary never asks for it, but it adds free speedup time and costs 851.62M Grain for all 30 levels, against 5.03B for the Sanctuary. Keep it level with the Sanctuary.
4. Training Grounds. The Sanctuary asks for them 9 times, and their level sets your best soldier tier: tier 7 at level 20, tier 8 at level 24 and tier 9 at level 27.
5. Farm, Lumberyard, Herb Garden and Antitoxin Workshop. Each is required 3 to 4 times, and Antitoxin Workshop 15 is on the level 30 list. One guide also advises keeping the Herb Garden at or above your Sanctuary level.
6. Walls (6 times), Alliance Hall (6), Warrior Statue (5), Infirmary (2) and Barracks (2). Raise each one when the Sanctuary window names it, not earlier.
7. Squads, Scout Squad, Watchtower, Tavern, Gear Workshop and the Raven buildings. The Sanctuary never asks for them, so level them for the feature they unlock.

Building Guide Video

This video walks through the building upgrade path in the order players use it. Watch it next to the list above to see how the Sanctuary, Research Lab and Training Grounds fit together in a real account.

Cost to Level 30

The table shows the total base cost of all 30 levels of each upgradable building, before Construction Speed bonuses and cost reductions, plus the might the building gives at level 30. Sorted by might, the Sanctuary leads with 384.3K, followed by the two research buildings and Walls.

Cheap levels give the most might for the price. Levels 1 to 10 of all upgradable buildings give about 3,111 might per million resources, levels 11 to 20 give 213, and levels 21 to 30 give only 40. The might page shows the other sources of might.

Builder's Hut

The Builder's Hut opens at Sanctuary 3 and has one effect, Free Speedup Time. The free time is 0 at level 1, 5 min at level 10, 10 min at level 15, 15 min at level 20 and 30 min at level 30. It gives 210,700 might at level 30, and the full upgrade costs 851.62M Grain, 2.57B Timber and 277.11M Herb over 199d 10h 56m.

Watchtower

The Watchtower opens at Sanctuary 8 and protects your base from enemy scouts. It has three stats: Anti-Scout Chance, Anti-Scout Hidden Intel and Scout Level. The chance rises by 20% per level until it hits 100% at level 5. Hidden intel grows from 0 to 5 entries by level 9 and then stops. From level 10, every level raises Scout Level, which reaches 22 at level 30. A level 30 Watchtower gives 311,100 might and costs 3.72B Grain, 3.72B Timber and 476.36M Herb.

Research Lab

The Research Lab, also called the 1st Lab, opens at Sanctuary 7. Its speed bonus rises from 0.7% at level 1 to 7.7% at level 15 and 15.1% at level 30. The full upgrade costs 4.48B Grain, 4.48B Timber and 1.4B Herb over 349d 0h 27m. The 2nd Workbench, or 2nd Lab, opens at Sanctuary 9 and adds a second research queue. The research guide explains both labs, the tree and the study scroll.

Training Grounds

Training Grounds open at Sanctuary 6, and the first level needs Barracks level 1. You can build up to 3: two from Sanctuary 6 and a third from Sanctuary 17. The building level sets the best soldier tier you can train, and tier 10 also needs the Elite Troop research. Barracks only store soldiers, so the grounds are the building that sets your army quality. The troops page covers training and morale.

The level 30 grounds give 280,200 might and cost 2.52B Grain, 2.52B Timber and 1.05B Herb over 299d 4h 12m.

Walls

Walls open at Sanctuary 4. City DEF stays at 10,000 on every level. What grows is the Wall DEF Decay Rate reduction and the Wall DEF Recovery Speed, which both rise by 1% per level to 30% at level 30. The Sanctuary asks for Walls 6 times, first at level 5. Level 30 Walls give 313,300 might and cost 1.74B Grain, 5.15B Timber and 1.09B Herb over 398d 20h 33m. Timber is the biggest part of that bill.

Squad 1-4 Buildings

Each Squad building is one more march queue. Squad March Speed starts at 0.7% on level 1 and ends at 15.1% on level 30. Squad 1 opens at Sanctuary 4 and needs Explorer's Camp level 1. Squad 4 opens at Sanctuary 5, Squad 2 at 8 and Squad 3 at 20. The level 30 might is 257,400 for Squad 1 to 257,500 for Squad 4. The squads page shows how to use each queue, and the research tree has a separate branch for every squad.

Infirmary

The Infirmary opens at Sanctuary 7, with a second copy at 13 and a third at 18. Its capacity rises from 677 at level 1 to 2,030 at level 30, and the level 30 building gives 280,500 might. The Sanctuary asks for it at levels 10 and 23. The full upgrade costs 3.87B Grain, 1.28B Timber and 1.04B Herb over 299d 4h 2m.

Antitoxin Workshop

The Antitoxin Workshop opens at Sanctuary 5, and you can build up to 5 copies. One workshop makes 1,556 Antitoxin per hour at level 1 and 259,666 at level 30. Antitoxin pays for hero levels: leveling one hero from level 2 to 150 costs 5.25B in total. The Sanctuary asks for the workshop at levels 12, 19 and 26, and wants level 15 for the final upgrade. The resources page lists the other ways to collect it.

Covert Operations

Black Ops is built once, opens at Sanctuary 9 and costs 480 Grain and 360 Timber. It runs Covert Operations: you send heroes on timed quests, wait for the timer to end and claim the rewards. There are 5 difficulty levels, and a higher Sanctuary level brings harder quests and better rewards. Levels 2 to 5 open at Sanctuary 13, 18, 23 and 27, and the daily quest count grows from 4 to 8. Quest quality is random: 68 percent SR, 24 percent SSR and 8 percent UR, and the UR quests are the Orange ones. Before you send heroes you can refresh a quest to choose better rewards, and Super Refresh turns every non-UR quest into UR. Quests refresh at 00:00 server time, and star quests refresh every 3 days. Covert Operations do not use a march queue. You can plunder the quest rewards of players outside your alliance 5 times a day and help alliance members 5 times a day.

Sanctuary

Sanctuary is the main building, available from the start and capped at level 30. Level requirements, costs and a planner are on the Sanctuary upgrade page.

Frequently Asked Questions

Read Next

• Sanctuary upgrade requirements
• Upgrade guide and progression
• Research guide and priority
• Squads and march queues
• Troops and training
• Resources and Antitoxin