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Mountain Pass Trap is the fourty-seventh offline mission and the fifty-first online mission in Earth Defense Force 2025 and the fourty-ninth offline mission and the fifty-third online mission in Earth Defense Force 4.1: The Shadow of New Despair.

Objective

2025: We are attacking the insects gathered in the mountains. An attack squad was sent, but they were forced back with casualties. The Retarius forms the hub of the enemy army making advance difficult. We'll send Air Forces a cannon squad and transport units. The Air Raiders will coordinate with these support squads. Good luck.

4.1: Our focus is now on the insects gathered in the mountains. An attack squad was sent, but they were forced back with casualties. The Retarius units now form the hub of the enemy army, making it quite difficult to advance. We'll send Air Forces, a cannon squad, and transport units, and the Air Raiders will coordinate with these support squads. Good luck!

Storyline

Storm Team and a team of Rangers are on top of a hill overlooking onto a valley where the Retiarii made their webs with giant insects covering them. The Tactics Officer reports that the Earth Eaters are slowly covering the Earth and most urban regions are lost to them. There isn't any more radio chatter after that. Sometime during the mission Earth Eaters also appear above the mountain. The mission ends when all insects are destroyed.

4.1 Changes

The mission starts at a lower area of the map and the webs are almost completely covering it.

The mission features more EDF units, but most of them already caught in the webs. HQ even orders to rescue them at the beginning of the mission.

There are more enemies and on harder difficulties mutant variants will also appear.

Allies

2025

  • A team of 5 Rangers with Assault Rifles appears near the players when they spawn.

4.1

  • A team of 5 Rangers with Rocket Launchers appears near the players when they spawn.
  • 4 individual Wing Divers 2 with LAZRs and 2 with Lances, one of each are squad leaders without squads, caught in the web closest to the players' spawn point.
  • A Ranger squad leader without a squad with a Shotgun, caught in the same web as the Wing Divers.
  • 5 individual Wing Divers 3 with Idunns and 2 with Thunder Bows, one of each are squad leaders without squads, caught in the web far away in the valley. They only appear when the players entered a certain range.
  • 6 individual Rangers 2 with Shotguns and 4 with Rocket Launchers, one of each are squad leaders without squads, caught in the web far away. They only appear when the players entered a certain range.

Enemies

2025

Wave Spawn Enemy Amount Notes
1st Appears at the beginning of the mission. Black Ant 30
Hornet 10
Retiarius 8
Spider 10
2nd Appears after a certain amount of time Earth Eaters They are completely passive.

4.1

Wave Spawn Enemy Amount Notes
1st Appears at the beginning of the mission. Black Ant 30
Hornet 20 Hardest or above:

10 normal and 10 Red Hornets instead.

Retiarius 9
Spider 60 Hardest or above:

50 normal and 10 Silver Spiders instead.

2nd Appears after a certain amount of time Earth Eaters They are completely passive.

Online Limits

Armor Limit

There's no limit for Inferno difficulty.

Difficulty Ranger & Air Raider Wing Diver Fencer
2025 4.1 2025 4.1 2025 4.1
Easy & Normal 991 989 545 544 1238 1237
Hard 2306 2572 1203 1336 2882 3215
Hardest 3537 4304 1818 2202 4421 5380

Weapon Level Limit

Game Easy & Normal Hard Hardest Inferno
2025 14 38 63 -
4.1 14 39 65 -

Approximate Weapon Drop Rate

Game Easy Normal Hard Hardest Inferno
2025 6-10 9-13 24-36 6-61 16-76
4.1 5-10 8-13 24-39 2-62 17-77

Strategy

4.1

Bring weapons that can deal with swarms of insects with enough range to hit Hornets. Also bring a high damage weapon against the Retiarii.

The mission is mostly a straight road that goes through the valley with the insects paced in small groups along it. While all of them are placed in one wave they won't attack until something provokes them which means that you can move slowly and kill one group at a time.

While it's pointed out on the mission's description that air and artillery support is given, nothing changes gameplay wise and they work like normal. Air Raiders might find it difficult to effectively use them because the webs are covering most of the area and they are protecting the bugs below. However since most support calls shoot multiple shots, if the first shots can destroy the webs the latter ones can get some hits in.

Levels: Earth Defense Force 2025
1-10 ReconveneSpreading DisasterWinged War GoddessSetting SunWind BreakUnderground CaveEruptionRetaliationBeach FearThe Return
11-20 Air ForceDay of the DemonsTakedownPreventing LandfallLand CollapseFortress SiegeValley ShadowsArtilleryBreaking ThroughShining Stronghold
21-30 Into the DepthsA TrapGiant RobotsAnchoredSilver CityCrimsonHigh-SpeedBrute ForceCharge Phase 1Charge Phase 2
31-40 Charge Phase 3ThunderInfiltrationConvergenceInfernoStarshipDenseCrossingSearchWaterside Bugs
41-50 AnnihilationNatural CalamitySteel BeastVoid ShipBlue FightersEarth DefendersMountain Pass TrapFortress FrenzyPincerRavages of War
51-60 Air MobilizationBug InvasionTransport Ship Surprise AttackBug KingCrazy SkiesThe Fleet BelowBad PremonitionCity of HorrorMountains AblazeBreaking Through (2)
61-70 Bug TowerFortress AttackMountain LiberationSniper AttackTowering BeastTeeth of the UniverseGiant ShipSpearheadTower SiegeDen of Thieves
71-80 Death QueenMachine SquadMonster PartyLabyrinth of LightCity FlawsMonster CampFallen FlagshipHeaven's ArmyEncirclingDivine
81-85 The ThreatBattle to the DeathMassive MobilizationScorchingStar Eaters

Levels: Earth Defense Force 2025 Online
1-10 ReconveneSpreading DisasterWinged War GoddessSetting SunWind BreakUnderground CaveEruptionRetaliationBeach FearThe Return
11-20 Air ForceDay of the DemonsTakedownPreventing LandfallLand CollapseFortress SiegeValley ShadowsArtilleryBreaking ThroughShining Stronghold
21-30 Into the DepthsA TrapGiant RobotsSummit ShipAnchoredSilver CityCrimsonHigh-SpeedBloody MountainBrute Force
31-40 Charge Phase 1Charge Phase 2Dark PrisonerCharge Phase 3ThunderInfiltrationConvergenceInfernoStarshipDense
41-50 CrossingSearchWaterside BugsAnnihilationNatural CalamitySteel BeastVoid ShipBlue FightersEarth DefendersFleet Attack
51-60 Mountain Pass TrapFortress FrenzyPincerRavages of WarAir MobilizationBug InvasionTransport Ship Surprise AttackBug KingCrazy SkiesThe Fleet Below
61-70 Bad PremonitionCity of HorrorMountains AblazeBreaking Through (2)Bug TowerFortress AttackMountain LiberationSniper AttackMountain GiantsTowering Beast
71-80 Teeth of the UniverseGiant ShipSpearheadTower SiegeDen of ThievesDeath QueenMachine SquadMonster PartyLabyrinth of LightCity Flaws
81-90 Monster CampFallen FlagshipHeaven's ArmyEncirclingDivineThe ThreatTroubled ValleyBattle to the DeathMassive MobilizationLegion of Monsters
91-94 ScorchingDemon ArmySurrounded!Star Eaters

Levels: Earth Defense Force 2025 DLC
DLC 1: Special Forces ExplorationGiant's AdvanceSilver CampCitadelFloating Fleet
DLC 2: Mutant Rampage AdvanceMountain AssaultEnemy Camp InfiltrationUnderground AdvanceGiant RobotsBattle SpeciesBeast MountainDark ArenaGathering AroundArmored SpeciesIron WallMountain of ChangeWhirlwind of DeathBugged CityThe ToughGolden DarknessTrue KingFinal ImpactInto DestructionShip of Dragons
DLC 3: Beyond Despair TrackingUnderground ComplexBlocked PassClose FormationDragon Ship FleetHeavy ArtilleryBloody RiverDangerous GoldminesBeast MobilizationTotal ProtectionAerial BombingKing of ArmorCannon DefendersTraps BehindFour Kings of NightmaresResistance Against the TwilightShivering NexusThree GiantsCrimson LotusStarry Prison

Levels: Earth Defense Force 4.1
1-10 ReconveneSpreading DisasterWinged War GoddessSetting SunWind ShearUnderground CaveEruptionRetaliationBeach FearThe Return
11-20 Air ForceDay of the DemonsTakedownPreventing LandfallLand CollapseFortress SiegeValley ShadowsArtilleryBreaking ThroughShining Stronghold
21-30 Into the DepthsA TrapGiant RobotsAnchoredSilver CityCrimsonAssaultHigh-SpeedBrute ForceCharge Phase 1
31-40 Charge Phase 2Charge Phase 3ThunderInfiltrationConvergenceInfernoStarshipHigh DensityDozing BeastCrossing
41-50 SearchWaterside BugsAnnihilationNatural CalamitySteel BeastVoid ShipBlue FightersEarth DefendersMountain Pass TrapFortress Frenzy
51-60 PincerRavages of WarCrashAir MobilizationBug InvasionTransport Ship Surprise AttackBug KingCrazy SkiesThe Fleet BelowIll Omen
61-70 City of HorrorMountains AblazeBreaking Through (2)Bug TowerFortress AttackMountain LiberationBattle of GiantsSniper AttackTowering BeastTeeth of the Universe
71-80 Giant ShipSpearheadTower SiegeDen of ThievesDeath QueenMachine SquadMonster PartyLabyrinth of LightCity FlawsMonster Camp
81-89 Fallen FlagshipHeaven's ArmyEncirclingDivineThe ThreatBattle to the DeathMassive MobilizationScorchingStar Eaters

Levels: Earth Defense Force 4.1 Online
1-10 ReconveneSpreading DisasterWinged War GoddessSetting SunWind ShearUnderground CaveEruptionRetaliationBeach FearThe Return
11-20 Air ForceDay of the DemonsTakedownPreventing LandfallLand CollapseFortress SiegeValley ShadowsArtilleryBreaking ThroughShining Stronghold
21-30 Into the DepthsA TrapGiant RobotsSummit ShipAnchoredSilver CityCrimsonAssaultHigh-SpeedBloody Mountain
31-40 Brute ForceCharge Phase 1Charge Phase 2Dark PrisonerCharge Phase 3ThunderInfiltrationConvergenceInfernoStarship
41-50 High DensityDozing BeastCrossingSearchWaterside BugsAnnihilationNatural CalamitySteel BeastVoid ShipBlue Fighters
51-60 Earth DefendersFleet AttackMountain Pass TrapFortress FrenzyPincerRavages of WarCrashAir MobilizationBug InvasionTransport Ship Surprise Attack
61-70 Bug KingCrazy SkiesThe Fleet BelowIll OmenCity of HorrorMountains AblazeBreaking Through (2)Bug TowerFortress AttackMountain Liberation
71-80 Battle of GiantsSniper AttackMountain GiantsTowering BeastTeeth of the UniverseGiant ShipSpearheadTower SiegeDen of ThievesDeath Queen
81-90 Machine SquadMonster PartyLabyrinth of LightCity FlawsMonster CampFallen FlagshipHeaven's ArmyEncirclingDivineThe Threat
91-98 Troubled ValleyBattle to the DeathMassive MobilizationLegion of MonstersScorchingDemon ArmySurrounded!Star Eaters

Levels: Earth Defense Force 4.1 DLC
DLC 1: Time of the Mutants Air OffensiveGiants AdvanceReconDust TownDefense LineUnderground AdvanceWar BreedMountain AssaultEnemy Camp InfiltrationDark ArenaBeast MountainGod's ArmyThe GatheringArmored SpeciesIron WallSilver BaseShifting MountainWhirlwind of DeathBugged CityToughnessGolden DarknessTrue SovereignFinal ImpactFloating FleetInto DestructionShip of Dragons
DLC 2: Extreme Battle Tracking BogeysUnderground ComplexBlocked PassClose FormationDragon Ship FleetHeavy ArtilleryOverflightDangerous GoldminesBeast MobilizationTotal ProtectionBombs AwayKing of ArmorCannon DefendersBloody RiverThree GiantsTraps from BehindThe Four HorsemenCross the LineFacing OffCrimson LotusShivering NexusLast BastionStarry Prison

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