Identify the enemy in front of you

Locust recognition and behavior[1][3]
EnemyRecognitionWatch for
DroneUpright humanoid infantry.Different guns, elite loadouts and coordinated tactics; unarmed Drones rush into melee.
WretchSmall, low-moving creature.Armored Wretches scream, disorienting you and limiting your actions.
BoomerBulky heavy gunner, much larger than a Drone.Heavy firepower; a chainsaw execution becomes possible at low health.
SeederLarge creature occupying a hole in the battlefield.Anti-air Nemacyst launches and a close-range encounter that exposes its weak head.
ReaverA large creature carrying Drone troops.Troop drops, heavy weapons and attacks from high walls.

Expose a Seeder’s weak point

  1. Get close to the Seeder’s position.
  2. Taunt it into emerging from its hole.
  3. Attack the fleshy head exposed when it flips over.[1]

E-Day turns the Seeder into a miniboss encounter as well as an anti-air Nemacyst launcher. Drawing it out creates the opening you need to damage its weak point.[1]

Reavers can change the firing angle

A Reaver can deliver a squad of Drones and leave, or stay to fight as a heavily armed threat. It can leap onto a high wall and cling there while firing down at the battlefield. Watch the creature’s movement as well as the infantry it deploys.[1]

Corpser and Brumak invasions

Horde Invasion Events announce the arrival of large Locust units, including Corpsers and Brumaks. These enemies bring supporting troops and a temporary map-wide modifier that can block extraction or disable Supply Caches. All participating squads receive a share of the rewards.[2]

These events are a reason to regroup with other squads. The Horde Siege guide explains revives, shared supplies and how to finish your own extraction after the threat is dealt with.[2]

Sources & further reading

  1. E-Day Gameplay UpdatesThe Coalition · July 31, 2026
  2. E-Day Multiplayer Deep DiveThe Coalition · July 30, 2026
  3. Gameplay reveal deep dive — Official Xbox PodcastXbox Wire · June 9, 2026