Immunity Protocol Weapons Guide: All Guns & Upgrades

Weapon Overview and Core Mechanics

In Immunity Protocol, your weapons are the primary tool for survival against relentless pathogen waves. Unlike traditional shooters, all weapons feature automatic firing — your role is to maneuver your immune cell sentinel while your equipped gun engages enemies. Each weapon belongs to a distinct class, offering unique firing patterns, damage types, and evolution potential. Understanding these core mechanics is the foundation of any successful run.

Weapons are not static; they evolve as you defeat enemies and collect experience orbs. Evolution typically occurs at set thresholds, unlocking new firing modes, increased projectile counts, or bonus status effects. You can carry up to two weapons at a time, and swapping between them is instant. The weapon system is directly tied to your character's class and loadout choices, so selecting the right tools for your build is critical.

Complete Weapon List and Stats

Below is the full catalog of weapons available in Immunity Protocol. Each entry includes its base damage per hit, fire rate (shots per second), starting projectile count, and the primary damage type. Damage types interact with enemy resistances and vulnerabilities, which you can explore in our enemy types guide.

Weapon Name	Base Damage	Fire Rate	Projectiles	Damage Type	Unlock Condition
Plasma Injector	12	5.0	1	Energy	Default
Nano-Sprayer	8	8.0	3 (spread)	Chemical	Default
Kinetic Lance	35	1.5	1	Physical	Reach Wave 5
Bio-Flame	15	3.0	1 (piercing)	Fire	Reach Wave 10
Viral Slicer	20	2.5	2	Slash	Defeat Elite Virus
EMP Burst	5	10.0	5 (arc)	Shock	Collect 3 Data Shards
Cryo Beams	10	4.0	2	Ice	Unlock Cryo Upgrade
Toxin Launcher	50	0.8	1	Poison	Reach Wave 20
Photon Array	18	6.0	4 (homing)	Light	Complete Challenge 3
Omega Cannon	100	0.3	1	Explosive	Prestige once

Best Weapon Synergies and Builds

Choosing the right weapon combination can dramatically increase your survivability and clear speed. Here are three proven loadout synergies that leverage the strengths of different weapon classes.

The Energy Sniper Build

This build focuses on high single-target damage to eliminate elite enemies and bosses quickly.

• Primary: Kinetic Lance (Physical)
• Secondary: Photon Array (Light)
• Key Passives: Damage Amplifier, Critical Eye, Range Enhancer
• Strategy: Use the Kinetic Lance to delete high-health targets from a distance, while the Photon Array handles groups with homing projectiles. This loadout excels in the boss guide encounters.

The Toxic Horde Clearer

Designed for wave-based survival, this build spreads status effects across the entire screen.

• Primary: Toxin Launcher (Poison)
• Secondary: Nano-Sprayer (Chemical)
• Key Passives: Toxic Spread, Duration Boost, Area of Effect Up
• Strategy: Fire the Toxin Launcher into dense clusters, then use the Nano-Sprayer to apply Chemical stacks. The combined damage-over-time will melt even large groups. Check our challenges guide for optimal farming routes.

The Electric Support

A utility-focused build that controls the battlefield and provides crowd control.

• Primary: EMP Burst (Shock)
• Secondary: Cryo Beams (Ice)
• Key Passives: Stun Chance, Slow Effect, Chain Lightning
• Strategy: EMP Burst stuns and chains between enemies, while Cryo Beams slow their movement. This combination is invaluable in co-op mode, where team support is crucial.

Weapon Upgrade Paths and Evolution

Understanding how to upgrade your weapons is essential for surviving later waves. Upgrades are obtained through three primary methods: Experience Leveling, Weapon Chests, and Synergy Combinations.

• Experience Leveling: As you defeat enemies, your weapons gain experience. Upon reaching a milestone (e.g., 100 kills), the weapon evolves to its next form. This is automatic and happens mid-run.
• Weapon Chests: Rare chests spawn on the map. Opening them grants a choice between two weapon-specific upgrades, such as "Piercing Shots" or "Explosive Rounds." These upgrades stack with evolution.
• Synergy Combinations: Certain passive items, when combined with specific weapons, unlock hidden evolution branches. For example, equipping the "Bio-Sensor" passive with the Bio-Flame weapon unlocks the "Napalm Blast" evolution.

For a detailed breakdown of all available passives and how they interact with weapons, refer to our upgrades guide. The progression system is deep, and planning your build from the start of a run is highly rewarding.

• Early Game (Waves 1-10): Focus on acquiring a primary weapon with good crowd control, such as Nano-Sprayer or Bio-Flame.
• Mid Game (Waves 11-20): Secure a second weapon for single-target damage (Kinetic Lance or Omega Cannon).
• Late Game (Waves 21+): Prioritize weapon evolution and synergy passives. Your weapon choices should complement your character class.

Frequently Asked Questions About Weapons

How do I unlock new weapons in Immunity Protocol? Most weapons are unlocked by reaching specific wave milestones or defeating certain enemy types. The unlock conditions are listed in the weapon table above. A few weapons require completing challenges or prestiging your character.

Can I change weapons during a run? Yes, you can carry two weapons at any time and swap between them instantly by pressing the weapon swap key. You cannot discard a weapon once picked up unless you find a weapon swap station, which are rare.

Do weapons have ammo? No, all weapons in Immunity Protocol have unlimited ammunition. The only limitation is the fire rate and any cooldown mechanics specific to certain abilities tied to the weapon's evolution.

What is the best weapon for beginners? The Plasma Injector is a well-rounded starting weapon with decent damage and fire rate. It is easy to use and has straightforward evolution paths. Pair it with the Nano-Sprayer for a balanced loadout.

Are there weapon skins or cosmetics? Currently, weapon skins are not available in the base game. However, future updates or DLC may introduce cosmetic options. Stay tuned to our patch notes guide for the latest announcements.