Iron Marines+ Mission 17 Game of Horns Strategy Guide

To beat Mission 17: Game of Horns in Iron Marines+, hold the narrow icy corridors on Borealis by pairing durable frontline units with long-range Snipers, upgrading lane turrets early, and expanding outward to secure auxiliary Ether refineries only after establishing your perimeter.

Early Base Setup and Chokepoint Defense

Hostile assault waves on Borealis trigger quickly after deployment. Plant your Command Center immediately, secure your starting Ether drop, and concentrate your starting forces within your base footprint rather than scouting down open paths.

1. Build base turrets first: Invest starting Ether into automated defenses before training extra squads. A Gatling or Laser turret placed at the most exposed entrance absorbs initial scouting packs without draining unit health.
2. Cluster opening units: Keep your starting squads positioned close to nascent base structures to defend builders from roaming patrols.
3. Preserve squad members: Avoid taking early losses. Reinforcing an existing squad costs significantly less Ether and build time than training an entirely new detachment.

Recommended Unit Composition and Roles

The indigenous beasts in Mission 17 feature heavy armor that mitigates basic infantry fire. Relying on basic Marines will lead to rapid attrition. Build your strike force around high-damage snipers and heavily armored melee blockers.

Place your Hero slightly ahead of your stationary turrets to intercept incoming rushers. If your Hero’s health drops to critical levels, retreat them behind your mechanical units to regenerate while the turrets and Snipers maintain damage output.

Expanding to Secondary Ether Refineries

Upgrading base defenses and producing heavy Walker frames requires capturing auxiliary Ether nodes. Capturing an outlying refinery triggers counter-assaults along alternating lanes, making base preparation mandatory before moving out.

• Fortify base lanes first: Ensure every lane leading to your Command Center has at least one upgraded defensive turret before launching an expansion expedition.
• Escort engineers: Move your mobile strike team together to clear the expansion node, plant the refinery, and immediately construct an outpost turret on the adjacent build pad.
• Hold until operational: Keep your combat squad stationed at the new node until the automated turret finishes building, then rotate back to defend your core perimeter.

Countering Horned Chargers and Swarms

The signature threat in Mission 17 comes from massive horned beasts that charge into defensive lines, knocking back frontline troops and dealing heavy damage to light infantry.

• Target priority: When the incoming wave warning sounds, inspect the minimap to track incoming heavy units. Manually command your Snipers to focus down the elite chargers before they reach your structures.
• Chokepoint abilities: Trigger your Hero’s area-of-effect abilities, orbital strikes, or shields right as the chargers group up in narrow gaps.
• Body-blocking breaches: If an elite pushes past your Walker line, move an auxiliary unit to intercept and body-block the beast while kiting injured Snipers backward.

Final Objective Push

The final hostile zone features clustered spawner nests supported by continuous enemy reinforcements. Rushing the objective with an all-out charge leaves your base vulnerable to secondary counter-attacks.

1. Leapfrog forward: Advance your Brawlers and Snipers incrementally, keeping your Hero stationed between the forward assault force and your base defenses.
2. Clear spawner nests sequentially: Destroy one spawner at a time from maximum range. If a defensive wave spawns, fall back slightly to fight within range of your nearest supporting turret.
3. Focus the final structures: Once the outer nests fall, focus all firepower on the primary objective structures and expend your remaining Hero abilities to clear the final counter-offensive wave.