The gears of war e-day locust swarm guide breaks down every enemy type you will face when the Horde erupts across Kalona, and understanding their AI is the difference between holding a position and getting overrun. Because the Locust do not just charge blindly — they flank, suppress, and retreat based on your squad's loadout and positioning — knowing how each unit thinks lets you prioritize targets before they reach your R.I.G. devices. This guide ranks every enemy from cannon fodder to nightmare fuel, explains the AI patterns that drive their behavior, and gives you the exact counters that veteran players rely on across all difficulty levels.
Understanding the Locust Swarm AI System
The enemy AI in E-Day operates on a layered threat-assessment system that constantly re-evaluates your squad's actions, which means the same Drone that walks straight into your Lancer fire might suddenly dive behind cover the moment you switch to a Gnasher. According to community testing on the official Gears of War website, the AI prioritizes three factors in real time: proximity to the objective, damage taken in the last five seconds, and whether a player is isolated from their squad. When you understand these triggers, you can manipulate the swarm into predictable patterns instead of reacting to chaos.
The AI director also scales aggression based on wave composition and difficulty, so a Wretch pack on Infantry difficulty behaves completely differently from the same pack on Allfather difficulty. On lower settings, Wretches commit to their first attack vector and rarely break off, while on higher settings they feint, scatter, and regroup before committing to a second rush. This adaptive behavior is why the gears of war e-day enemy ai explained discussions on community forums keep emphasizing that you cannot rely on memorized spawn patterns alone — you have to read the swarm's current intent.
How the Threat Assessment Works
Every Locust unit has a hidden aggression meter that fills based on your actions, and once it hits a threshold, the unit commits to a specific behavior tree. For example, a Drone that takes a headshot will immediately drop its aggression meter to zero and seek cover, while a Drone that only takes body shots keeps pushing forward. This is why the community recommends focusing headshots on advancing Drones rather than spraying center mass — you are not just dealing damage, you are resetting their AI state.
Wave Composition and AI Synergy
The swarm also uses unit synergy where certain enemy combinations trigger shared behavior patterns, and recognizing these combos lets you predict what comes next. When a Boomer appears alongside Wretches, the Wretches will screen the Boomer's advance while it winds up its Boomshot, and if you kill the Boomer first, the Wretches immediately scatter into a disorganized frenzy. The table below breaks down how common wave compositions alter AI behavior:
| Wave Composition | AI Behavior Shift | Counter Strategy |
|---|---|---|
| Wretches + Drones | Wretches flank wide while Drones push center | Hold fire until Wretches commit, then focus Drones |
| Boomer + Wretches | Wretches screen Boomer's advance | Kill Boomer first to break the formation |
| Corpser + Drones | Corpser tunnels while Drones suppress from cover | Listen for tunnel audio cue, reposition before breach |
| Brumak + everything | All units push aggressively, no retreat behavior | Focus Brumak weak points, ignore adds until it staggers |
Ranking Every Enemy Type in E-Day
The gears of war e-day enemy types ranked list below comes from aggregated player experiences across the first month of Horde Siege, and it reflects both raw threat level and how difficult each unit is to counter consistently. While a Wretch is individually weak, its pack behavior can overwhelm an unprepared squad faster than a single Brumak, which is why the ranking considers the full context of how each enemy appears in waves. The tiers range from S-Tier (priority kill targets that can wipe a squad) down to C-Tier (nuisance units that are easily managed with proper positioning).
| Tier | Enemy Type | Threat Level | Best Counter |
|---|---|---|---|
| S | Brumak | Extreme | Hammer of Dawn, sustained Lancer fire on chest core |
| S | Corpser | Extreme | Incendiary grenades, focus legs to slow tunnel speed |
| A | Boomer | High | Active reload Gnasher blast, keep distance |
| A | Elite Drone | High | Headshot chains, cover flanks |
| B | Drone | Medium | Lancer burst fire, active reloads |
| B | Wretch | Medium (pack) | Shotgun blasts, melee counters |
| C | Ticker | Low | Single pistol shot, maintain spacing |
S-Tier Threats: Brumak and Corpser
The Brumak is the single most dangerous unit in the gears of war e-day locust bosses list because it combines massive health with a rocket barrage that can one-shot players on higher difficulties, and its AI actively targets the R.I.G. devices you are supposed to defend. According to the Gears of War Fandom Wiki, the Brumak has a chest core that only exposes after you deal enough damage to its legs, which means you need to coordinate fire across your squad. The Corpser is nearly as dangerous because it tunnels underground and emerges directly beneath your position, forcing you to listen for audio cues and reposition constantly.
A-Tier Threats: Boomer and Elite Drone
The Boomer earns its A-Tier ranking because its Boomshot can instantly down a player who is not paying attention, and its AI is smart enough to lead its shots against moving targets. Elite Drones are the most dangerous infantry unit because they carry Boltok pistols and Torque Bows, and their AI actively flanks while maintaining cover discipline. Community reports indicate that Elite Drones will retreat and heal if they take too much damage, so you need to commit to kills rather than trading shots.
Elite Locust Units and Their Unique Behaviors
The gears of war e-day elite locust guide covers the special units that spawn on higher waves and in specific mission objectives, and each one has a unique AI pattern that requires a different response. Unlike standard Drones, elite units have armor plates that deflect bullets until destroyed, and they also have access to better weapons and more aggressive behavior trees. The table below summarizes the elite units you will encounter and their defining traits:
| Elite Unit | Signature Weapon | Unique AI Trait | Weakness |
|---|---|---|---|
| Elite Drone | Torque Bow | Flanks aggressively, retreats to heal | Headshot after armor break |
| Boomer | Boomshot | Leads shots, screens with Wretches | Gnasher blast to face |
| Kantus | N/A (support) | Revives downed Locust, buffs allies | Kill first, disrupt support |
| Theron Guard | Longshot | Snipes from range, calls reinforcements | Flank while focused on squad |
Kantus Support AI
The Kantus is the most underrated threat in the game because it does not deal direct damage, but its AI actively revives downed Locust and provides damage resistance buffs to nearby units. If you leave a Kantus alive, you will fight the same Drones multiple times, and the swarm will slowly grind down your ammunition reserves. The community consensus is that the Kantus should be your first priority target whenever it appears, even above Boomers and Elite Drones.
Theron Guard Sniping Behavior
The Theron Guard behaves like a sniper, and its AI will actively reposition to maintain line of sight on your squad while staying out of effective Lancer range. Because the Theron Guard can call in reinforcements, you need to either close the distance quickly or assign one player to counter-snipe with a Longshot. Player reports suggest that the Theron Guard's AI will prioritize players who are standing still, so constant movement is essential when it is on the field.
Horde Siege Enemy Strategies and Positioning
The gears of war e-day horde enemies behave differently in Horde Siege missions than they do in the campaign, because the objective-based structure changes how the AI prioritizes targets. When you are defending a R.I.G. device, the Locust will actively ignore players to attack the objective, which means you need to position yourself between the swarm and the device rather than chasing kills. The official E-Day Horde Siege news page confirms that missions scale from level 10 through max level across Infantry, Commander, and Allfather difficulties, and each difficulty tier changes the AI's aggression and coordination.
Defensive Positioning Against the Swarm
The most effective defensive strategy is to establish a kill zone where multiple players can focus fire on a single choke point, because the AI will funnel through the path of least resistance. If you spread out too thin, the swarm will exploit the gaps and flank your position, which is why coordinated squads always designate a primary and secondary firing line. The table below shows the optimal squad positioning for different wave types:
| Wave Type | Primary Position | Secondary Position | Notes |
|---|---|---|---|
| Wretch rush | Narrow corridor | Elevated platform | Shotguns for close range |
| Boomer + Drones | Wide open area | Behind cover | Keep distance from Boomshots |
| Corpser breach | Elevated position | Flanking route | Watch for tunnel audio cues |
| Brumak assault | Scattered positions | R.I.G. defense | Focus fire on legs |
Extraction Phase Tactics
Every Horde Siege mission ends with an extraction phase where you need to clear the landing zone and board the Raven, and the AI becomes significantly more aggressive during this final push. The swarm will spawn continuously during extraction, so you need to conserve ammunition and focus on reaching the landing zone rather than clearing every enemy. Player experience suggests that the extraction phase is where most squads fail, because they try to fight every wave instead of sprinting for the Raven.
Herding the Swarm: Aggro Baiting and Flank Tactics
Understanding the gears of war e-day enemy ai explained mechanics at a deeper level lets you manipulate the swarm into favorable engagements, and veteran players have developed several techniques that exploit the AI's decision-making. One of the most effective techniques is baiting — exposing one player to draw the swarm's aggression while the rest of the squad flanks from a different angle. Because the AI prioritizes isolated players, you can use a decoy to split the swarm and create kill opportunities. Because the AI prioritizes isolated players, you can use a decoy to split the swarm and create kill opportunities, though this tactic works best when you understand how the different unit types in the Gears Of War E Day Locust Horde react to being separated from their pack.
Aggro Management Techniques
The AI's threat assessment system can be manipulated by controlling who deals damage first, because the unit that lands the first hit typically draws the swarm's attention. If you have a player with a Boomshot or Torque Bow open an engagement, the swarm will focus on that player, allowing the rest of the squad to reposition. The key is to rotate aggro between players so that no single person takes sustained fire, which is why coordinated squads use a tank and spank approach even in a third-person shooter.
Exploiting AI Retreat Behavior
When the AI retreats to heal, it follows a predictable path back to the nearest emergence hole, and you can use this behavior to set up ambushes. If you position a player near the emergence hole before triggering the retreat, you can catch the fleeing enemy as it tries to escape. This technique is especially effective against Elite Drones, which have a longer retreat animation and are vulnerable during the heal sequence.
Frequently Asked Questions
What is the best weapon for dealing with Wretch packs?
The Gnasher Shotgun is the most effective weapon against Wretch packs because its spread pattern hits multiple targets at close range, and the AI's tendency to swarm makes them easy to catch in a single blast. Active reload the Gnasher to maximize damage per shot, and use melee to interrupt their leap attacks.
How do I counter the Brumak's rocket barrage?
The Brumak's rockets can be dodged by staying in constant motion and using cover, but the most reliable counter is to focus fire on its legs to force a stagger. Once the Brumak staggers, its chest core exposes, and you should unload your heaviest weapons into that weak point.
Do Elite Drones retreat and heal?
Yes, Elite Drones will retreat to the nearest emergence hole when their health drops below a certain threshold, and they will heal over time if left alone. To prevent this, commit to the kill once you engage an Elite Drone, and use a Boltok or Longshot to finish it before it reaches the hole.
What is the best squad composition for Horde Siege?
A balanced squad with one player focused on crowd control (Gnasher, Incendiary Grenades), one on long-range support (Longshot, Torque Bow), and two on sustained damage (Lancer, Retro Lancer) covers all enemy types effectively. Communication is essential, because the AI punishes disorganized squads with flanking maneuvers.
How does the AI change on Allfather difficulty?
On Allfather difficulty, the AI becomes significantly more aggressive and coordinated, with enemies flanking more aggressively and retreating less frequently. Wretch packs will feint and regroup before committing, and Boomers will lead their shots more accurately. The AI also spawns elite units in larger numbers, so you need to prioritize targets quickly.