Atrax

Atrax is a heavy, legged T2 Serpulo mech unit that specializes in close-range area denial by firing slag projectiles that leave damaging puddles. It appears among the Crawler line of units and is produced in the Additive Reconstructor alongside the basic Crawler. Atrax is durable with 600 health, carries 50 items, and is built to assault bases where flammable materials and ground defenses are common.

The Atrax weapon fires two streams at close range with a combined firing rate of 2 × 3.33 shots/sec, dealing 13 damage per hit and applying Melting for about 2 seconds. Each hit produces slag puddles on the ground that damage structures and terrain and apply lasting ground damage; the weapon cannot target air units. Atrax can step over most terrain and small walls thanks to its large legs, which makes it difficult to stall and allows it to traverse fortifications other ground units cannot. Historically it was introduced as the Eruptor and later renamed and given large legs; current key stats include a movement speed of around 4.5 tiles/sec and an effective range of 13 blocks.

Atrax interacts with status effects and defenses in several notable ways. It is immune to Burning and is also listed among the very few units immune to Melting; at the same time, its attacks apply the Melting status to targets and create slag that can spread damage and destroy flammable defenses. This combination makes Atrax specially suited to maps or targets that rely on coal, Graphite, Pyratite, or oil-based defenses: it can trigger chain fires and structural decay that rapidly undermine enemy installations. Because slag puddles damage walls, Atrax groups can create persistent hazardous zones that are only removable or manageable with dedicated repair support such as Menders.

Practical usage and strategy:

• Use Atrax in attacks against bases that rely on flammable production or fuel lines; its slag and Melting application cause disproportionate havoc where volatile materials are common. Custom maps with flammable defenses amplify its impact.
• Avoid relying on fire-only turrets like Scorch to stop Atrax; Scorch requires flammable ammo to be effective and may be counterproductive. Prefer mid- to long-range turrets such as Lancer, Hail, and Ripple to engage Atrax safely outside its range.
• Wave turrets supplied with Water or Cryofluid help by slowing Atrax and extinguishing small fires spawned by slag. Menders alleviate the continuous wall damage from slag puddles.
• Atrax cannot hit air units; spam of flying attackers like Horizon can neutralize groups of Atraxes without exposing your air units to ground damage.
• On defense, Atrax provides an accessible source of Melting application when Scrap/Slag is absent on a map; pairing it with Tarred or other synergistic effects increases damage dealt to armored targets, though some other status combinations (Blasted + Freezing, Shocked + Wet) can outclass it in raw damage or accessibility depending on tech and resource constraints.
• If the map allows tier-3 production or the current defensive strategy is unsuitable for fire-based effects, upgrade Atraxes into Spirocts for higher damage and a sapping effect that helps defeat most tier-4 units in groups.

Atrax’s role is niche but powerful: a durable, terrain-crossing suicide-style mech best deployed where its slag and Melting output can cascade through an enemy base’s flammable infrastructure.