
For players who've already burned speedups on the wrong building and don't want to do it again...
The Sanctuary is the core of everything in Last Asylum: Plague. Every system feeds into it or depends on it. But the game throws so many upgrade options at you simultaneously that most players end up spreading their resources too thin, upgrading whatever the quest system points them to instead of following a progression order that actually compounds.
This guide covers the upgrade priority that produces the fastest competitive progress, where speedups and resources should go first, and the building order that serious spenders use to avoid wasting their investment on low-return upgrades.
Last Asylum: Plague gates nearly every system behind building levels. Hero capacity, resource production, troop training, defensive capabilities, and event participation all depend on having the right buildings at the right levels. Upgrading in the wrong order doesn't just slow you down. It creates cascading bottlenecks that waste your investment.
The classic mistake: upgrading your Sanctuary level as fast as possible without stabilizing the production buildings that support it. You end up with a high-level Sanctuary that demands resources your economy can't produce, and you're forced to either buy resources at retail or wait days for production to catch up.
Smart upgrade order means your economy supports your ambitions at every stage.
Resources are the foundation of everything. If your production buildings lag behind your Sanctuary level, you'll be in a constant deficit that forces you to spend on resource packs instead of progression packs.
Farm produces grain, which feeds your population and fuels troop training. Lumberyard produces timber, which is the primary construction material. Herb Garden produces herbs, which are critical for medicine crafting and patient treatment.
The general rule: your production buildings should always be at or near the maximum level your current Sanctuary allows before you push the Sanctuary to the next tier. This ensures your economy can support the increased demands each new Sanctuary level introduces.
Production without storage is waste. If your warehouses cap out while you're offline, your production buildings keep running but the excess disappears. For players who can't check the game every few hours, warehouse capacity directly determines how much passive progress you actually capture.
Upgrade warehouses so their capacity always exceeds what your production buildings generate during your typical offline period. If you check the game twice a day, your warehouses need to hold at least 12 hours of production without capping.
Once your production and storage can support the next tier, push your Sanctuary level. Each Sanctuary level unlocks new buildings, higher upgrade caps for existing buildings, and access to new game systems. But the Sanctuary level itself doesn't produce anything. It just opens doors. Make sure you can walk through those doors before you open them.
Patient treatment is one of Last Asylum: Plague's unique systems. Your hospital ward capacity determines how many patients you can treat simultaneously, which affects your reward flow and progression through story content. Upgrade ward capacity after your core economy is stable but before pushing into combat-heavy content.
Defensive building upgrades matter for Rat Swarm performance and for protecting your base from raids. The priority here: upgrade your primary choke point towers first (consistent with the Rat Swarm strategy), then expand defensive coverage as resources allow.
If Last Asylum: Plague includes a research or technology tree (as most 4X games do), these buildings provide permanent bonuses that compound over time. Research upgrades typically have long timers, so starting them early and keeping them running continuously is important. But they shouldn't take priority over production and storage, because those buildings fund everything else.
Anything that doesn't directly contribute to resource production, combat capability, or progression should be upgraded last. Some secondary buildings provide minor bonuses that are nice to have but don't move the competitive needle.
Speedups are one of the most valuable resources in any 4X game, and Last Asylum: Plague is no exception. How you use them matters as much as which buildings you upgrade.
Speedups should go to buildings that unlock other upgrades or produce immediate value. Rushing a Sanctuary level that opens new building tiers is a high-return use. Rushing a decorative building upgrade is not.
Many 4X games run events that reward you for spending speedups during specific periods. If Last Asylum: Plague follows this pattern (and most do), stockpiling speedups for event windows produces bonus rewards on top of the upgrade value itself.
The temptation to use speedups just because you have them is strong. Resist it. Speedups spent outside of high-return upgrades or event windows are speedups you won't have when they matter most.
For players investing $1,000+/month, the building priority is the same. What changes is the pace.
Early game (first 30 days): Invest heavily in production and storage. This is where your spending produces the highest compound returns. A strong economy in the first month pays for itself many times over in reduced resource-pack spending later.
Mid-game (months 2-4): Shift investment toward combat buildings, hero infrastructure, and event preparation. Your economy should be self-sustaining by this point, allowing you to redirect spending toward competitive systems.
Late game (months 4+): Focus on marginal improvements, research completion, and event-cycle optimization. The buildings that matter at this stage are the ones that provide percentage-based bonuses, because those scale with your existing power.
Share a standard upgrade path with your alliance. When all members follow the same general priority, the alliance reaches competitive capability faster. Members who upgrade randomly take longer to contribute to alliance events.
Coordinate speedup usage around events. If your alliance saves speedups for the same event windows, the collective bonus scoring is significantly higher.
Identify members who are bottlenecked and help. An alliance member stuck because they upgraded their Sanctuary too fast and can't produce enough resources is a member who can't contribute to events. Help them stabilize.
What should I upgrade first in Last Asylum: Plague? Resource production buildings (Farm, Lumberyard, Herb Garden) first, then storage (Warehouses), then Sanctuary level. This ensures your economy supports each new tier before you advance.
Should I rush my Sanctuary level in Last Asylum: Plague? Not before your production and storage can support the increased demands. Rushing Sanctuary level without a stable economy creates resource deficits that force you to buy resource packs at retail.
When should I use speedups in Last Asylum: Plague? On high-return upgrades that unlock new tiers or provide immediate competitive value. Save speedups for event windows whenever possible to capture bonus rewards.
What is the best building upgrade order for Last Asylum: Plague? Production, then storage, then Sanctuary level, then hospital wards, then defensive structures, then research, then secondary buildings. This order ensures each upgrade tier is supported by the infrastructure beneath it.
Sanctuary progression is a sustained spending commitment. Speedups, resources, and builder packs all add up across months of competitive play. For players who are already investing at competitive levels, the efficiency of those purchases determines how quickly your Sanctuary reaches its potential.
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• Upgrade production buildings (Farm, Lumberyard, Herb Garden) before pushing Sanctuary level. Economy first, always.
• Storage buildings should hold at least 12 hours of production to capture passive progress while you're offline.
• Sanctuary level unlocks systems but doesn't produce anything on its own. Push it after your economy supports the next tier.
• Speedups are most valuable during event windows and on upgrades that unlock new tiers. Don't waste them on low-return buildings.
If you are spending, you should invest heavily in production infrastructure during the first 30 days. The compound returns pay for themselves. Alliance leaders should share a standard upgrade path so all members reach competitive capability on the same timeline.
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