Base defense setup: Portal Suppression, Shock Traps, and Tesla Coils

Understanding the Core Defense Problem

Portal storms and assault events can spawn hostile creatures inside a base if the area lacks proper suppression. The primary tool for preventing interior spawns is the Portal Suppression Field upgrade for the Crafting Bench. Without this upgrade, enemies may appear directly inside a claimed room, bypassing any perimeter traps.

The official Abiotic Factor Wiki describes Base Defense as a crafting category used specifically for defending against Portal Storms and Assault Events. This means the defense setup must address both random storm spawns and scheduled raid waves.

Prerequisites Before Building

Before placing any traps or powered defenses, check these three conditions:

The Portal Suppression Field upgrade is listed as the first requirement in the official Base Defense Guide. Building traps before this upgrade risks having enemies spawn past the defenses entirely.

Section 1: Portal Suppression Field Priority

The Portal Suppression Field upgrade on the Crafting Bench is the foundation of any base defense. This upgrade creates a zone where portal storms cannot deposit enemies inside the protected area.

Installation workflow:

1. Ensure the Crafting Bench has power from a battery or generator
2. Craft the Portal Suppression Field upgrade at the bench
3. Activate the upgrade through the bench interface
4. Verify the suppression field covers the entire base interior

The suppression field does not prevent enemies from walking in through doors or windows. It only stops interior spawns from storms. This means perimeter defenses remain necessary for stopping ground-based attackers.

Recovery advice: If enemies continue spawning inside after installing the upgrade, check that the bench has continuous power. A drained battery during a storm will disable the field. Consider adding a backup battery dedicated to the bench alone.

Section 2: Shock Traps for Entry Points

Shock Traps are described as an early option that requires no external power, is cheap to craft, and provides strong crowd control. These traits make them suitable for protecting doorways and narrow passages without burdening the power grid.

Placement guidelines:

• Position Shock Traps just inside doorways so enemies commit to entering before triggering
• Place traps in narrow halls, stair turns, or furniture-funneled paths
• Avoid open rooms where enemies can path around the trap zone
• Add a second trap behind the first if larger enemies survive the initial shock

The Reddit community example shows players using three Shock Traps spaced out on the ground inside a base, combined with Tesla Coils and turrets. This spacing prevents multiple traps from triggering on the same enemy while covering a wider area.

Recovery advice: After each assault, inspect Shock Traps for damage. Replace any that triggered during the raid. If a trap never activated, consider moving it to a different doorway where enemies actually path.

Section 3: Tesla Coils with Buffered Power

Tesla Coils provide area-of-effect damage but require a dedicated power setup. The source material specifies that Tesla Coils need their own buffered branch and a Lever for safe on/off control.

Power branch setup:

1. Connect a battery bank to a separate power line from the main base grid
2. Attach a Lever switch between the battery bank and the Tesla Coils
3. Run power from the Lever to the Tesla Coils
4. Keep the Lever in the OFF position during normal base operations
5. Flip the Lever ON only when an assault event begins

The buffered branch prevents a defense power spike from draining the battery that runs refrigerators, lights, or crafting stations. The Lever control allows safe passage through the base when not under attack.

Common failure scenario: Running Tesla Coils on the same power branch as food storage or living utilities. When the coils activate during a raid, they can drain the battery and spoil stored food or disable chargers.

Recovery advice: If Tesla Coils fail to activate during a raid, check the battery charge on the defense branch first. If the battery is drained, increase the battery count or reduce the number of coils on that branch. If the Lever was left in the OFF position, develop a habit of flipping it before leaving the base.

Section 4: Combined Defense Layout

A practical base defense combines all three systems in a layered approach:

Route judgment: Place the Crafting Bench in a room with controlled entrances, not in an open lobby. If enemies can approach from three directions, move the bench before investing in traps. The bench is the primary target during Assault Events according to the official wiki.

Numbered workflow for first-time setup:

1. Upgrade the Crafting Bench with Portal Suppression Field and verify coverage
2. Watch one assault event without traps to identify which doors enemies use
3. Place Shock Traps at those specific doorways only
4. Set up a separate battery branch with a Lever for Tesla Coils
5. Add Tesla Coils behind the melee position, not in walking paths
6. Repair all traps immediately after the first successful assault

Recovery advice for failed defenses: If enemies reached the Crafting Bench despite traps, check three things in order: the suppression field was active during the storm, the Shock Traps were placed on the correct doorways, and the Tesla Coil branch had power when the Lever was flipped. Fix the failed layer before adding more traps.