Leyak Abiotic Factor: spawn pressure, X-Ray tools, and containment

What this guide solves

The Leyak is not a normal enemy you clear once and forget. It is a recurring anomaly threat that can interrupt looting, crafting, and sector travel after it enters your progression path. Treat it like a route-management problem: you need one reliable response in your inventory, one safer response at base, and one containment plan for later.

This page focuses only on Leyak handling. If you are looking for the separate night resource called Anomaly, use the Anomaly capture guide instead.

Confirmed Leyak response tools

The important distinction is control. The X-Ray Lamp is a mobile answer, but it depends on you noticing the Leyak and reacting. The X-Ray Tower is less flexible but safer once installed because it creates a protected zone around a fixed location. Containment Unit: 91 is the planned solution, not the first panic button.

Route priority: lamp first, tower second, containment third

Do not build your Leyak plan around containment first. Containment only helps if you can bring the Leyak near the unit and trigger the correct X-Ray response. Before that, you still need to survive the ordinary encounters that happen while you are moving through the facility.

Use this order:

1. Carry an X-Ray Lamp when Leyak risk is active. This gives you a direct field response away from base.
2. Place an X-Ray Tower where interruptions hurt most. Good candidates are crafting rooms, storage rooms, and staging areas where you stop often.
3. Prepare Containment Unit: 91 only after the route is safe enough. The unit needs deliberate positioning and a controlled encounter.

This order keeps the page honest: the wiki confirms the roles of the items, but your route plan decides when each one matters.

Leyak encounter flow

Use the flow as a checklist, not as a promise that every encounter feels the same. Your goal is to stop improvising. If the Leyak appears, your hand should already know where the X-Ray Lamp is, and your base should already have a tower covering the places where you stand still.

Field response checklist

If you repeatedly lose track of the Lamp in inventory, fix that before pushing deeper into Leyak territory. A correct item buried under loot is not a real response during a chase.

Base setup for fewer interruptions

Place fixed Leyak protection where you pause, not where it looks decorative. The best locations are usually near:

• Crafting Bench and nearby storage.
• Repair and recovery stations.
• A route door you use repeatedly.
• The area where co-op players gather before leaving base.

Keep the X-Ray Tower concept separate from ordinary base defense. Chopinators, powered traps, blades, and other defenses solve physical enemy movement. X-Ray tools solve the Leyak. For broader base defense planning, use the base defense upgrade path and the Crafting Bench upgrade guide.

Containment Unit: 91 planning

Containment Unit: 91 changes the problem from reaction to positioning. The wiki describes containment as drawing the Leyak near the unit and blasting it with an X-Ray Lamp or X-Ray Tower. That means the setup has three parts:

Do not attempt containment in a cluttered storage room where you can get stuck on crates or furniture. A clean staging area is safer than a perfect-looking corner that blocks movement.

Common mistakes

Final route rule

The practical Leyak route is simple: carry the Lamp, protect the base with a Tower, then attempt containment once you can control the space around Containment Unit: 91. That sequence turns the Leyak from a random panic check into a planned anomaly-management loop.