Immunity Protocol Class Guide – Best Builds & Strategies

Understanding Immunity Protocol Classes

In Immunity Protocol, your chosen class defines your core playstyle, starting abilities, and evolutionary path. Each class represents a different type of immune cell sentinel, with unique strengths that shine against specific pathogen types. Unlike traditional class systems, your selection here determines your weapon evolution tree and available symbiont slots from the very first wave.

Classes are not locked permanently. Through the progression system, you can unlock and switch between classes as you unlock new loadout slots. However, mastering one class deeply often yields better results than spreading your resources thin.

Sentinel Class Overview

The Sentinel is the balanced starting class, unlocked by default. It features a medium fire rate, moderate damage, and a versatile weapon evolution path that adapts to any situation. Sentinels excel at sustained combat and can equip up to three symbionts by mid-game. Their passive ability, Adaptive Membrane, grants a small damage resistance bonus that increases as your health decreases, making them forgiving for newcomers.

For beginners, the Sentinel offers the most straightforward path to understanding core mechanics. Pair it with the beginner guide for foundational tips.

Phage Class – Aggressive Frontliner

The Phage class is a high-risk, high-reward brawler. Its weapon evolves into short-range but devastating viral cleavers that deal area damage. Phages start with a unique Symbiont slot dedicated to offensive modules only, and their passive, Cellular Rage, increases attack speed by 15% for each nearby enemy within melee range.

Best builds for Phage focus on stacking lifesteal and damage reduction. Equip the Leeching Membrane symbiont to convert a portion of your cleaver damage into health. Combine with the Adrenaline Gland for a 20% movement speed boost when below 30% health. This class struggles against airborne pathogens, so prioritize the Flak Cannon weapon evolution early. Check our loadout guide for detailed symbiont combinations.

Macrophage Class – Defensive Anchor

The Macrophage is the tank class, designed to absorb damage and control crowds. Its weapon fires slow, heavy projectiles that create temporary slowing fields on impact. The passive ability, Debris Shield, generates a protective barrier that blocks one hit every 12 seconds, scaling with your maximum health.

Macrophage builds should emphasize health regeneration and area denial. The Osmotic Barrier symbiont is essential, granting a 25% health regeneration bonus while standing still. Pair it with the Necrotic Aura to deal continuous damage to enemies within close range. This class excels in the challenges mode where holding a position is critical. For deeper strategy, read our challenges guide.

Dendrite Class – Support & Utility

The Dendrite class focuses on buffing allies and debuffing enemies. In single-player mode, its support capabilities translate into powerful self-buffs and enemy debuffs. The weapon fires homing darts that mark targets, increasing all damage taken by 10% for 5 seconds. The passive, Synaptic Relay, reduces ability cooldowns by 20% when you defeat a marked enemy.

Optimal Dendrite builds revolve around cooldown reduction and mark efficiency. The Neural Overclock symbiont reduces all cooldowns by an additional 15% when your health is above 75%. Combine with the Mark of Vulnerability to extend mark duration by 3 seconds. This class requires precise positioning and target prioritization, making it ideal for experienced players.

Cytokine Class – Glass Cannon

The Cytokine class is the ultimate damage dealer, sacrificing survivability for raw offensive power. Its weapon evolves into a rapid-fire energy beam that increases in damage the longer you fire at a single target. The passive, Overdrive, increases critical hit chance by 5% for each consecutive hit on the same enemy, stacking up to 5 times.

Cytokine builds demand perfect evasion and positioning. Equip the Focus Lens symbiont to increase beam range by 30% but reduce movement speed by 10%. The Kinetic Capacitor adds a 15% chance to fire a second beam simultaneously. This class pairs well with the prestige system, as prestige bonuses can offset its fragility.

Class Synergies & Team Compositions

While Immunity Protocol is a single-player game, understanding class synergies helps when planning your run. Each class's weapon evolution tree branches into three paths, and your choice should complement your symbiont loadout.

For example, a Phage with the Leeching Membrane benefits from the Bloodletter evolution, which adds a stacking bleed effect. A Macrophage with Osmotic Barrier should choose the Fortress evolution, turning your slowing fields into healing zones. Refer to our character builds guide for complete evolution trees and recommended paths.

Frequently Asked Questions

Which class is best for beginners?
The Sentinel class is recommended for new players due to its balanced stats and forgiving passive ability. It allows you to learn enemy patterns and upgrade systems without excessive pressure.

Can I change my class mid-run?
No, your class is locked once you begin a run. You can, however, unlock and switch classes in the main menu between runs using currency earned from gameplay.

Do classes affect the story or endings?
Classes do not alter the main story or endings. However, certain lore entries and achievements are class-specific, encouraging multiple playthroughs. Check our achievements guide for details.

How do I unlock all classes?
The Sentinel is available from the start. The Phage unlocks after reaching wave 15 in any run. The Macrophage requires defeating the first boss. The Dendrite unlocks by completing 10 challenges. The Cytokine is unlocked through the prestige system at prestige level 3.