Iron Marines+ Into Darkness Spec Ops Mission Guide

To beat the Into Darkness Special Operation in Iron Marines+, advance in tight formation through narrow choke points, keep a tank or hero half a step ahead to absorb ambushes, and destroy Fell spawner hives immediately upon engagement.

Visibility and Movement Rules

Into Darkness limits map vision and hides burrowed Fell swarms along constricted corridors. Moving across the map without triggering fatal ambushes requires strict movement discipline:

Short-range pathing: Move your units in short increments rather than issuing long-distance move commands. This prevents frontline units from outrunning their fire support.
Chokepoint holds: Halt your squad at narrow passes and rock outcroppings. Let your hero reveal hidden enemies while your ranged units remain set in firing stances.
Defensive retreats: When an ambush wave unearrows, step back toward previously cleared, illuminated ground. Funneling enemies through narrow corridors neutralizes multi-directional flanks and groups targets for area-of-effect abilities.

Squad Composition and Hero Selection

A successful strike team requires durable frontliners to soak melee cleave and dedicated ranged units to eliminate swarms and heavy targets. Do not deploy pure infantry formations, as unarmored units quickly succumb to poison spray and explosive charges.

Frontline anchors: Deploy Brawlers or a Walker mech to halt incoming waves at choke points.
Ranged support: Pair your frontline with Flamewalkers to melt dense packs of low-tier crawlers, or Snipers to eliminate heavy monstrosities at range. Keep Snipers escorted at all times; their slow movement speed and minimum firing range leave them helpless if bypassed.
Hero deployment: Place your hero slightly ahead of your squad to trigger burrowed enemies and draw opening attacks.

Hero	Role	Recommended Ability Usage
Ajax	Defensive Tank	Fire crowd-control stuns the moment burrowed enemies surface.
Kara	Ranged DPS	Launch burst ordnance directly onto clustered Fell nests.
Taggins	Support / Buffer	Activate defensive shields during sudden high-damage ambushes.

How to Clear Fell Hives

Static Fell hives continuously spawn alien reinforcements that drain your squad's health and resources. Clear each sector using this sequence:

Halt outside the perimeter: Stop your team just outside the hive's detection radius and eliminate detached patrol bugs before advancing.
Lock the lane: Position your hero or Walker directly between the hive and your ranged units.
Focus down the spawner: Direct active hero damage skills and heavy squad fire directly at the hive. Destroying the structure cuts off the flow of reinforcements.
Mop up and recover: Clear remaining stragglers with basic attacks. Wait for passive shield meters to recharge and replace fallen squad members before stepping back into the fog.

Reinforcement and Recovery Tactics

Special Operations operate on limited Ether and replacement budgets. To prevent costly attrition:

Avoid mid-fight panic purchases: Squad replacements spawn with travel delays and can be picked off individually if your frontline collapses. Rebuild squads only after the immediate skirmish ends.
Cycle damaged units: Pull wounded squad members behind your hero so shields can regenerate while the frontline absorbs aggro.
Fall back when flanked: If side passages release swarms behind your firing line, withdraw your entire squad to the nearest illuminated section to re-establish your firing angle.