Voidtrain arena waves test your combat preparation against scaling swarms of hostile insects in an isolated arena island. Successfully surviving these rounds yields high-tier Strange Chests, crafting components, and Acid required for mid-to-late game progression.
Early Access updates originally featured extended combat gauntlets lasting up to 15 waves. However, official patch changes rebalanced the encounter, capping the current Arena Island challenge at 5 waves with revised enemy scaling and the introduction of the Arena Master.
How to Find and Enter the Arena
Arena Islands appear periodically along the void tracks once unlocked in your playthrough. Their presence is marked by floating Ruined Platforms alongside the rails, identifiable by glowing lanterns and nesting Portal Birds.
To initiate the event:
- Stop your train along the track near the ruined platform.
- Approach the nesting Portal Birds (often referred to by players as floating jellyfish-like creatures) at the back of the platform and interact with them.
- Arrive in the Arena Bubble, a staging dome situated above the arena floor where you can regroup with co-op teammates.
- Interact with the Arena Master console in the center of the bubble to accept the challenge and teleport down to the battleground below.
If you decide not to fight before starting, Portal Birds on the outer ring of the Arena Bubble allow you to warp back to your train immediately.
Wave Progression and Modifiers
The Arena encounter functions on a risk-and-reward system. After completing each wave, you can interact with the central monolith console to claim your accumulated loot and leave, or choose to risk your earnings for another round. If you die before extracting, you lose the accumulated run rewards, though your personal inventory remains intact and you receive a minor consolation payout of basic materials.
Wave 1 begins with standard Swarm numbers, but every subsequent wave stacks random percentage-based difficulty modifiers:
- Enemy Count Increase: Increases the total number of insects spawned during the round.
- Enemy Health Increase: Multiplies insect hit points, requiring significantly more ammunition to defeat them.
- Enemy Damage Increase: Increases the damage inflicted by insect melee hits and acid projectiles.
By Wave 4 and Wave 5, combined modifiers frequently increase enemy statistics by 50% to 75% or higher, making ammo conservation and armor maintenance crucial.
Swarm Enemy Types and Weak Points
The insects encountered in the arena are unique to these islands and behave differently than human soldiers encountered at outposts and depots.
| Enemy Type | Primary Threat | Observed Weaknesses & Counterplay |
|---|---|---|
| Soldier Beetles | Swarm in large groups; melee rush and spit acid if you take high ground. | Shoot their glowing eyes/head; unarmored early on, though later waves equip protective chitin helmets. |
| Spitting Beetles | Keep their distance and fire accurate, long-range acid globs. | Target from range early in the wave; break line of sight using trees and rock formations. |
| Bombardier Beetles | Dash toward players, inflate, and explode into an acid burst. | Eliminate them before they close the distance to trigger the "BOOM!" Steam achievement. |
| Tank Beetles | Massive health pool; ground spike attacks and thick frontal armor plates. | Target the unarmored legs/feet, shoot off individual armor plates, or use armor-piercing weapon modules. |
A common obstacle noted during the Tank Beetle encounter is its ground shockwave or spike attack, which knocks players into the air and inflicts heavy damage. Players on community forums note that continuously sprinting sideways can help evade the strike. Additionally, standing on elevated stone pillars or arena structures can prevent the ground tremor from connecting.
Arena Wave Rewards and Chest Transport
Pushing through all 5 waves maximizes the payout provided by the Arena Master upon extraction. The primary rewards include:
- Strange Chests: Surviving all 5 waves awards up to three chests across increasing tiers (Tier 2, Tier 3, and Tier 4 chests, ranging from standard to ornate golden designs).
- Acid: A critical chemical resource needed to craft rubber and advance higher-tier workbench research.
- Crafting Materials: Loose drops of wood, scrap metal, and basic chemicals.
Because high-tier Strange Chests occupy your heavy carry slot, solo players cannot carry every chest back to the train in a single trip. After taking your rewards at the monolith, grab the first chest, interact with the exit Portal Bird to warp back to your train, deposit the container, and interact with the platform's Portal Bird to return and retrieve the remaining chests.
Preparation and Combat Tactics
Entering an arena unprepared can easily result in depleted ammunition and broken armor. Applying these player-tested loadout and movement strategies improves your odds of survival:
- Wear Upgraded Armor: Equipping second-tier leather armor allows you to slot two armor plates instead of one. Keep a stack of extra armor plates in your inventory (press Q to hotkey-repair during combat) to absorb damage before your health pool takes a hit.
- Manage Weapon Ammunition: The starter revolver possesses infinite ammo, making it ideal for clearing basic Soldier Beetles during Waves 1 and 2. Reserve high-capacity automatic frames, shotguns, or special core weapons (such as Ice Storm or Annihilator) for later waves when Tank Beetles and armored variants spawn.
- Bring Food, Water, and Bandages: Hunger and thirst continue to deplete while fighting on the island. Enter the trial with topped-off meters and carry spare consumables so depleted stats do not degrade your maximum health or sprint stamina.
- Exploit Arena Terrain: Narrow bridges, rock clusters, and staircases allow you to bottleneck rushing melee beetles. Because insect AI paths aggressively along ground surfaces, circling around stairways gives you time to reload without taking direct projectile hits.
Frequently Asked Questions
How many waves are in the Voidtrain arena?
Current game versions feature a maximum of 5 waves in the Arena Island encounter. While early developer builds and early access footage featured up to 15 waves, the system was streamlined to a 5-wave gauntlet overseen by the Arena Master.
What happens if you die during an arena wave?
If you are defeated in the arena, your personal inventory items (weapons, hotbar tools, and gear) are preserved. However, you forfeit the accumulated wave rewards (such as high-tier Strange Chests and stockpiled Acid) and receive only a small consolation bundle of basic resources.
How do you get Acid in Voidtrain?
Acid is primarily acquired as a wave reward from completing Arena Island battles. It is used at crafting stations to manufacture rubber and research advanced technologies.
Can you replay an Arena Island?
Each Arena Island encountered along the railway track can only be activated and completed once per run segment. After you take your rewards and return to your train, the platform cannot be re-triggered; you must drive along the void to locate the next ruined platform.
