Game River released Mechabellum out of Early Access on 26 September 2024 with Dreamhaven publishing. It is an auto-battler played entirely between rounds: you spend supply on units, place them on a grid, buy tech upgrades and draft reinforcement cards, then watch the battle resolve without touching anything. Around 29 units exist, and almost every one of them is the answer to some other one, so reading your opponent's board matters more than any single strong unit.
Choosing the right build shapes your entire experience. This guide breaks down every option: what they're good at, what they struggle with, and which one matches your playstyle. For optimized builds with full gear sets, see our builds guide.
Quick Comparison
| Build | Tier | Playstyle | Best Equipment | Beginner Friendly? |
|---|---|---|---|---|
| Chaff swarm | A | Balanced | Crawler | Yes |
| Anti-air | A | Balanced | Fang | Yes |
| Artillery | A | Balanced | Arclight | Yes |
| Giant | A | Balanced | Marksman | Yes |
| Air | A | Balanced | Fortress | Yes |
New player? Start with Anti-air. See our beginner's guide for why.
Chaff swarm
Chaff swarm is a strong option in Mechabellum.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | Crawler |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Round-based deployment on a grid |
Strengths
- Highest overall performance across all content types
- Solid all-around choice
- Pairs well with Crawler
Weaknesses
- Popular choice, competition for resources
- Needs specific gear to reach full potential
Recommended Progression
- Start in 1v1 Ranked to learn Chaff swarm-specific mechanics
- Focus on Round-based deployment on a grid. It's this build's primary system
- Prioritize Crawler as your first major upgrade
- See our full Chaff swarm build guide for the optimal gear progression
Anti-air
Anti-air is a strong option in Mechabellum.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | Fang |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Unit tech upgrades |
Strengths
- Most versatile, adapts to any situation
- Solid all-around choice
- Pairs well with Fang
Weaknesses
- Lower peak damage than S-tier options
- Needs specific gear to reach full potential
Recommended Progression
- Start in 1v1 Ranked to learn Anti-air-specific mechanics
- Focus on Unit tech upgrades. It's this build's primary system
- Prioritize Fang as your first major upgrade
- See our full Anti-air build guide for the optimal gear progression
Artillery
Artillery is a strong option in Mechabellum.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | Arclight |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Reinforcement card drafts |
Strengths
- Best survivability for learning hard content
- Solid all-around choice
- Pairs well with Arclight
Weaknesses
- Slower progression speed
- Needs specific gear to reach full potential
Recommended Progression
- Start in 1v1 Ranked to learn Artillery-specific mechanics
- Focus on Reinforcement card drafts. It's this build's primary system
- Prioritize Arclight as your first major upgrade
- See our full Artillery build guide for the optimal gear progression
Giant
Giant is a strong option in Mechabellum.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | Marksman |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Starting specialist selection |
Strengths
- Excellent in group and cooperative content
- Solid all-around choice
- Pairs well with Marksman
Weaknesses
- Less effective solo
- Requires deep game knowledge to use effectively
Recommended Progression
- Start in 1v1 Ranked to learn Giant-specific mechanics
- Focus on Starting specialist selection. It's this build's primary system
- Prioritize Marksman as your first major upgrade
- See our full Giant build guide for the optimal gear progression
Air
Air is a strong option in Mechabellum.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | Fortress |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Counter reading between rounds |
Strengths
- Highest skill ceiling with unique mechanics
- Solid all-around choice
- Pairs well with Fortress
Weaknesses
- Steep learning curve, punishing mistakes
- Requires deep game knowledge to use effectively
Recommended Progression
- Start in 1v1 Ranked to learn Air-specific mechanics
- Focus on Counter reading between rounds. It's this build's primary system
- Prioritize Fortress as your first major upgrade
- See our full Air build guide for the optimal gear progression
Which Build Should You Pick?
For Beginners
Anti-air is the clear winner. It's forgiving, teaches core mechanics, and remains competitive into endgame. Follow our beginner's guide for the best first-session experience.
For Maximum Performance
Chaff swarm is the top pick once you understand the game's mechanics. Pair it with Crawler for the strongest overall setup.
For a Challenge
Air offers the highest skill ceiling. It's punishing when misplayed but incredibly rewarding when mastered. Only recommended after you've completed the game with another build.
For Group Play
Giant shines in cooperative content with utility and team support capabilities.
More Mechabellum Guides
- Mechabellum Mechabellum Overview
- Mechabellum Best Builds
- Mechabellum Tier List
- Mechabellum Walkthrough
- Mechabellum Beginner's Guide
- Mechabellum Tips & Tricks
- Mechabellum Weapons Guide
- Mechabellum Combat Guide
- Mechabellum Boss Guide
- Mechabellum Maps & Locations
- Mechabellum Crafting Guide
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- RimWorld Classes Guide: strategy game with similar mechanics
