The Callisto Protocol is a third-person survival horror game set in a maximum-security prison on Jupiter's moon Callisto, where inmates are transforming into monstrous Biophage creatures. Created by the co-creator of Dead Space, it features a melee-focused combat system built around dodge timing and counter-attacks, complemented by the GRP gravity tool for environmental kills. The game emphasizes resource scarcity, atmospheric tension, and brutal close-quarters encounters in claustrophobic prison corridors. Post-launch updates added a New Game+ mode and additional difficulty options.
Your choice of equipment defines your damage output and playstyle. This guide ranks every major option, explains what makes each one strong, and tells you which builds they pair best with.
Equipment Rankings
| Equipment | Tier | Best For | Notes |
|---|---|---|---|
| Stun Baton | S | Melee Brawler, Stealth Player | Your starting melee weapon that remains effective when fully upgraded. |
| Hand Cannon (Pistol) | A | Gunslinger, Balanced Survivor | Standard sidearm with 12-round magazine and reliable accuracy. |
| Skunk Gun (Shotgun) | A | Gunslinger, GRP Specialist (backup) | Devastating close-range weapon dealing 200 damage per blast. |
| Assault Rifle | B | Gunslinger, Boss encounters | Full-auto ranged weapon found in later chapters. |
| GRP Module | B | GRP Specialist, All builds | Gravity tool that grabs and throws enemies or objects. |
S-Tier: Stun Baton
Your starting melee weapon that remains effective when fully upgraded. 3-hit combo deals 120 total damage. Combos are extended with upgrades for a 5-hit chain dealing 250 damage. The dodge-counter into baton combo is the core combat loop.
| Attribute | Detail |
|---|---|
| Tier | S |
| Best For | Melee Brawler, Stealth Player |
| Key Mechanic | dodge melee system |
| Recommended Build | Melee Brawler |
How to get it: Available from mid-game onward. See our walkthrough for the exact progression point.
Best builds using Stun Baton: Pairs naturally with Melee Brawler thanks to stat scaling synergies.
A-Tier: Hand Cannon (Pistol)
Standard sidearm with 12-round magazine and reliable accuracy. Headshots deal 3x damage. Upgraded magazine holds 18 rounds and the alternate fire mode adds burst shot. The most ammo-efficient ranged weapon due to headshot multiplier.
| Attribute | Detail |
|---|---|
| Tier | A |
| Best For | Gunslinger, Balanced Survivor |
| Key Mechanic | GRP kinesis tool |
| Recommended Build | GRP Specialist |
How to get it: Accessible in the early-to-mid game. Check our maps guide for the location.
Best builds using Hand Cannon (Pistol): Pairs naturally with GRP Specialist thanks to stat scaling synergies.
A-Tier: Skunk Gun (Shotgun)
Devastating close-range weapon dealing 200 damage per blast. 4-round magazine with slow reload. Knocks enemies backward, creating space in tight corridors. Best reserved for multi-enemy encounters where melee is too risky.
| Attribute | Detail |
|---|---|
| Tier | A |
| Best For | Gunslinger, GRP Specialist (backup) |
| Key Mechanic | mutation system |
| Recommended Build | Gunslinger |
How to get it: Accessible in the early-to-mid game. Check our maps guide for the location.
Best builds using Skunk Gun (Shotgun): Pairs naturally with Gunslinger thanks to stat scaling synergies.
B-Tier: Assault Rifle
Full-auto ranged weapon found in later chapters. 30-round magazine with moderate damage per shot. Burns through ammo rapidly but highest sustained DPS against bosses. Save it exclusively for boss fights.
| Attribute | Detail |
|---|---|
| Tier | B |
| Best For | Gunslinger, Boss encounters |
| Key Mechanic | stealth mechanics |
| Recommended Build | Stealth Player |
How to get it: Found in later areas. Our walkthrough covers when you can access this.
Best builds using Assault Rifle: Pairs naturally with Stealth Player thanks to stat scaling synergies.
B-Tier: GRP Module
Gravity tool that grabs and throws enemies or objects. Upgraded for faster recharge, higher capacity, and stronger throws. Throwing enemies into environmental hazards (spikes, fans, pits) kills instantly regardless of enemy health. The most efficient kill method.
| Attribute | Detail |
|---|---|
| Tier | B |
| Best For | GRP Specialist, All builds |
| Key Mechanic | weapon upgrading |
| Recommended Build | Balanced Survivor |
How to get it: Found in later areas. Our walkthrough covers when you can access this.
Best builds using GRP Module: Pairs naturally with Balanced Survivor thanks to stat scaling synergies.
Equipment Progression Path
The order you should acquire equipment as you progress:
- Starting gear → Enough to clear Black Iron Prison
- Hand Cannon (Pistol) → Your first real upgrade, available early
- Skunk Gun (Shotgun) → Mid-game upgrade with good scaling
- Stun Baton → Best-in-slot, aim for this by late game
- Upgrade to max → The power spike from max upgrades is enormous
Equipment Tips
- Always upgrade your primary equipment before diversifying — one strong option beats three mediocre ones.
- Match your equipment to your build's stat priorities for maximum scaling.
- Alternate dodge directions (left, right, left) to avoid all combo attacks. Dodging the same direction twice in a row gets hit by the follow-up swing.
- Check our tier list for how equipment rankings affect overall build effectiveness.
More The Callisto Protocol Guides
- The Callisto Protocol The Callisto Protocol Overview
- The Callisto Protocol Best Builds
- The Callisto Protocol Tier List
- The Callisto Protocol Walkthrough
- The Callisto Protocol Beginner's Guide
- The Callisto Protocol Tips & Tricks
- The Callisto Protocol Combat Guide
- The Callisto Protocol Boss Guide
- The Callisto Protocol Maps & Locations
- The Callisto Protocol Crafting Guide
- The Callisto Protocol Classes & Characters
Similar Games
If you enjoy The Callisto Protocol, check out these related guides:
- Phasmophobia Weapons Guide — horror game with similar mechanics
- Lethal Company Weapons Guide — horror game with similar mechanics
- Dead by Daylight Weapons Guide — horror game with similar mechanics
