1. Read the path
Identify where rats naturally bunch together before you spend tower resources.
Rat Swarm
Rat Swarm Defense Guide
Rat Swarm is the PvE tower-defense pressure test of Last Asylum: Plague. You win by preparation: focused towers, correct hero roles, and enough burst to survive the Rat King phase.
How it works
Rat Swarm is a resource allocation test.
Waves of infected rats follow fixed paths toward the Sanctuary. Players build and upgrade towers, deploy up to five heroes, then survive until the final boss wave: the Rat King.
2. Build choke points
One strong kill zone usually beats weak towers scattered across every lane.
3. Place roles clearly
Tank in front, damage behind, support where it keeps the core alive.
4. Save boss burst
Manual ability timing matters most when the Rat King enters the lane.
Tower priority
Concentrated firepower beats coverage.
| Priority | Tower role | Placement | Purpose |
|---|---|---|---|
| 1 | Slow / control | Choke entrance | Gives every damage tower more time per enemy. |
| 2 | Area damage | Behind slow towers | Clears regular waves and chips the Rat King while enemies are grouped. |
| 3 | Single-target damage | Boss-focused lane | Useful for the Rat King, but lower priority until the choke is strong. |
Rat King readiness
Do not force the boss when the waves already look bad.
If the last normal wave barely clears, the boss attempt usually wastes materials. Upgrade the core hero group, strengthen the primary choke point, and try again once pre-boss waves clear with margin.
- Core tank survives without collapsing early.
- Main DPS has enough burst for the boss phase.
- Support keeps the team stable during longer fights.
- Primary choke point is upgraded before secondary lanes.
- Medicine and repairs are restocked before the swarm starts.
Hero roles
Rat Swarm team template.
| Role | Examples mentioned in guides | Why this role matters |
|---|---|---|
| Tank | Arthur, Daskal, Shadow, Brian, Louis, Billy | Keeps the team alive through longer waves and boss pressure. |
| Main DPS | Marlena, Zoya, Annie, Jester, Red Lady, Cynthia | Provides the burst or wave damage needed to finish high-health targets. |
| Support | Harper, Nicole, Bell | Improves team damage, healing, or survivability during longer fights. |
| Flex | Second tank, extra carry, or support | Choose based on whether regular waves, boss burst, or frontline collapse blocks progress. |
Defend the walls
Prepare your choke point before the Rat King arrives.
Play Last Asylum: Plague and test your heroes, towers, and sanctuary economy against the swarm.
