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.
Picking the right build determines how your experience plays out. These builds are ranked by overall effectiveness, factoring in damage, survivability, gear requirements, and how well they scale into endgame. New to the game? Start with our beginner's guide first.
Quick Rankings
| Build | Tier | Playstyle | Core Gear |
|---|---|---|---|
| Chaff swarm | A | Balanced | Best available |
| Anti-air | A | Balanced | Best available |
| Artillery | A | Balanced | Best available |
| Giant | A | Balanced | Best available |
| Air | A | Balanced | Best available |
For detailed meta rankings, see our Mechabellum tier list.
A-Tier: Chaff swarm
Chaff swarm is a top-performing option in Mechabellum.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Crawler | The cheapest melee swarm unit and consistently rated one of the strongest in the game. |
| Core Gear | Best available for your level | Maximizes build potential |
| Stat Priority | Balanced offensive and defensive stats | Optimal scaling |
| Key Mechanic | Round-based deployment on a grid | Each round you spend supply on new units and reposition existing ones, then the battle plays out on its own. |
How to Play Chaff swarm
Chaff swarm focuses on a balanced approach to content.
Why this build works: Crawler does the damage and Round-based deployment on a grid keeps it running, which is why this sits at the top of the list. See our weapons guide for detailed equipment breakdowns.
Pros:
- Highest overall performance
- Straightforward gearing path
- Works in all content types
Cons:
- Popular pick, resources may be contested
- Needs specific gear to reach full potential
A-Tier: Anti-air
Anti-air is a strong option in Mechabellum.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Fang | Cheap ranged light bots that form a wide firing line. |
| Core Gear | Best available for your level | Maximizes build potential |
| Stat Priority | Balanced offensive and defensive stats | Optimal scaling |
| Key Mechanic | Unit tech upgrades | Every unit has its own upgrade options bought individually, so an Arclight can take Anti-Air to cover your sky problem or Armor to survive longer against light attackers. |
How to Play Anti-air
Anti-air focuses on a balanced approach to content.
Why this build works: Pair Fang with Unit tech upgrades and the build stops depending on a good start, so it holds up across most content. See our weapons guide for detailed equipment breakdowns.
Pros:
- Most versatile option
- Straightforward gearing path
- Works in all content types
Cons:
- Lower peak damage than S-tier
- Needs specific gear to reach full potential
A-Tier: Artillery
Artillery is a strong option in Mechabellum.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Arclight | A medium ground unit whose value comes from its upgrade choices rather than its base statistics. |
| Core Gear | Best available for your level | Maximizes build potential |
| Stat Priority | Balanced offensive and defensive stats | Optimal scaling |
| Key Mechanic | Reinforcement card drafts | Between rounds you pick from cards sorted into levels, from cheap level 0 options like Elite Marksman and Assault Fang up to level 3 cards like Nuke, Lightning Storm and Mustang Production Line. |
How to Play Artillery
Artillery focuses on a balanced approach to content.
Why this build works: Reinforcement card drafts covers the gap Arclight leaves open, so the build stays usable even when a fight goes badly. See our weapons guide for detailed equipment breakdowns.
Pros:
- Best survivability
- Straightforward gearing path
- Works in all content types
Cons:
- Slower clear speeds
- Needs specific gear to reach full potential
A-Tier: Giant
Giant is a specialized option in Mechabellum.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Marksman | A long-range single-target sniper that outranges most of what it shoots at. |
| Core Gear | Best available for your level | Maximizes build potential |
| Stat Priority | Balanced offensive and defensive stats | Optimal scaling |
| Key Mechanic | Starting specialist selection | You choose one specialist from a pool of four at the start, and most hand you either extra supply or a free unit. |
How to Play Giant
Giant focuses on a balanced approach to content.
Why this build works: This one leans on Starting specialist selection rather than raw numbers, and Marksman is what makes that trade pay off. See our weapons guide for detailed equipment breakdowns.
Pros:
- Strong in group/team content
- Straightforward gearing path
- Excels in its niche
Cons:
- Weaker solo performance
- Requires deep game knowledge
A-Tier: Air
Air is a specialized option in Mechabellum.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Fortress | A top-tier giant that absorbs a great deal of punishment while contributing steady damage. |
| Core Gear | Best available for your level | Maximizes build potential |
| Stat Priority | Balanced offensive and defensive stats | Optimal scaling |
| Key Mechanic | Counter reading between rounds | You see the enemy board before committing your next purchase, and almost every unit is hard countered by something. |
How to Play Air
Air focuses on a balanced approach to content.
Why this build works: Fortress and Counter reading between rounds pull in the same direction here, which separates this from the safer picks above. See our weapons guide for detailed equipment breakdowns.
Pros:
- Unique, rewarding playstyle
- Straightforward gearing path
- Excels in its niche
Cons:
- High skill floor, punishing when misplayed
- Requires deep game knowledge
Build Progression Path
- Start with Anti-air: the most forgiving option for learning the game
- Transition to Chaff swarm once you understand core mechanics and have access to Crawler
- Keep a Artillery setup for content that keeps killing you
- Try Air for a fresh experience once you've mastered the basics
Follow our walkthrough for the optimal progression path through each area.
Gearing Tips
- Invest in your primary equipment first, since it gives the biggest power spike. See our weapons guide for rankings.
- Look at the enemy board before you spend a single point of supply. You get to see what they fielded, and almost every unit in the game has a clean answer, so buying blind throws away the mode's central advantage.
- Take the starting specialist that hands you a free unit rather than extra supply, particularly if the unit is rare. A unit on the board from round one compounds across the whole match in a way that a supply cushion does not.
- Don't spread upgrade resources across multiple builds until endgame
More Mechabellum Guides
- Mechabellum Mechabellum Overview
- 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
- Mechabellum Classes & Characters
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