M-25 Rumbler

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Fully upgraded M-25 Rumbler
M-25 Rumbler silhouette.png

"The Rumbler portable mortar is a heavy piece of equipment and very clunky in its operation. Its clunkiness is tolerated however, mostly because of its immense firepower, but also because it is a variable distance indirect fire weapon. The Rumbler is part of the Weapons equipment kit."
- Armory Description

Stratagem Code[edit | edit source]

Players must enter the following sequence, using the controller d‑pad, in order to call down this single-use Stratagem during a mission:
Arrow 1 D.pngArrow 2 L.pngArrow 4 U.pngArrow 2 L.pngArrow 2 L.png

Unlock Requirement[edit | edit source]

The M-25 Rumbler is a DLC weapon, available at any rank to those who purchase the Weapons Pack.

Upgrades[edit | edit source]

Upgrade Cost Effect
Strat M-25 Rumbler mk1.png Mk1 Basic variant, no upgrades.
Strat M-25 Rumbler mk2.png Mk2 Research-point.png 2 An larger autoloading magazine allows more shots before reload. Magazine size increased from 2 to 4.
Strat M-25 Rumbler mk3.png Mk3 Research-point.png 3 The weapon now fires toxic grenades that will deal poison damage to anything caught near the detonation.

Weapon Stats[edit | edit source]

  • The weapon comes with 2 magazines of Rumbler mortar shells, and can carry up to 4. By default, the weapon can fire 2 bursts before requiring a reload; the Mk2 has double the capacity, allowing for 4 bursts between reloads.
  • Reloading the Rumbler immobilizes the operator and takes 4.5 seconds to complete.
M-25 'Rumbler' Detailed Analysis
Weapon Info Additional Notes
Unlock Rank Rank 1 Unlocked via DLC
Weapon Type Secondary
Weapon Category Mortar
Fire Mode Salvo fire, indirect fire
Base Upgraded Additional Notes
Damage 0 0
Center Mass Damage 0 0
Anti-Personnel Explosive Damage 350 350
Anti-Personnel Explosion Radius 3.5 m 3.5 m
Direct Explosive Damage 1800 1800
Direct Explosion Radius 2.5 m 2.5 m
Status Effects None Heavy Poison;
Slow Poison*
* Requires Mk3 upgrade
Heavy Poison Damage/sec N/A 100/s* * Requires Mk3 upgrade; only Heavy Poison damages over time
Heavy Poison Duration N/A 5 s* * Requires Mk3 upgrade
Poison Slowdown N/A -75%* * Requires Mk3 upgrade
Slow Poison Duration N/A 6 s* * Requires Mk3 upgrade
AP Ammo Armor Reduction 0 0
Base Upgraded Additional Notes
Cyclic Rate of Fire (RPM) 66 66 Should be 60, but 66 has been observed
Capacity 2 4 Requires Mk2 upgrade
Starting Mags 2 2
Max Mags 4 4
Reload Speed 4.5 s 4.5 s No tactical reload; immobilized while reloading
Min Spread todo todo
Max Spread todo todo
Spread Increase per Shot todo todo
Max Range todo todo
Bullet Spread Simulation todo

Gameplay Tips[edit | edit source]

  • The Rumbler launches bursts of three 80mm grenades at a time, saturating a small area with firepower. It's highly useful for softening up enemies before they reach your teammates, with less risk of hitting them in crossfire.
  • Aiming the Rumbler takes training and patience. It works by holding the trigger to increase elevation, then releasing the trigger to fire. It is not recommended to rotate during aiming unless one is highly familiar with the weapon, as this will cause the mortar grenades to be fired in a small arc over a large area — potentially wiping out an entire squad of Helldivers in one salvo.
  • The Mk3 upgrade adds a very powerful toxic agent to the mortar grenades, which can kill a nearby Helldiver three times over (similar to the effects the TOX-13 Avenger or Mk3 Missile Barrage have on human tissue).
    • Helldivers that have been poisoned can still be saved, however, by quickly moving over to them and helping them off the ground three times in quick succession as the poison wears itself out.
  • The shells fired by the Rumbler are physical objects that can collide with various other objects in the game, causing the shells to explode. Standing too close to obstacles (such as walls or trees), nearby enemies or other players can cause the Rumbler to misfire, instantly killing the user and anything else caught within the blast. Anything organic that survives the initial blast will also suffer from the Mk3 Rumbler's Toxic effects.
    • Other causes for the projectiles to explode in mid-air include (but are not limited to):
      • Being detonated by enemy fire (specifically the Cyborg IFV's main cannon and the Warlord's gauss-cannon);
      • Colliding with ejected shells -- a prime example being the SG-225 Breaker's shotgun-fire; the Rumbler is especially dangerous to fire around the A/MG-11 Minigun Turret and EXO-44 Walker Exosuit as these tend to saturate the air around them with flying shell casings;
      • Colliding with airborne players using the LIFT-850 Jump Pack (although airborne Lift-users remain unaffected by the explosion and its resulting status effects);
      • Being caught in Static Field Conductors (further research is needed, as this is hard to reproduce reliably).
  • The Rumbler is capable of destroying mission objectives that would ordinarily require the use of a NUX-223 Hellbomb, such as Bug Nests, Illuminate Beacons and Cyborg AA Guns. Cyborg IFVs must be hit in the rear to be destroyed, but all other heavily armored enemies are easily dealt with regardless of impact point.

Gallery[edit | edit source]

Notes[edit | edit source]

Sidearms Assault rifles LMGs Shotguns SMGs Precision Explosive Laser tech Arc tech
P-2 Peacemaker AR-19 Liberator MG-105 Stalwart SG-225 Breaker SMG-45 Defender LHO-63 Camper CR-9 Suppressor LAS-5 Scythe AC-3 Arc Thrower
P-6 Gunslinger AR-22C Patriot SG-8 Punisher MP-98 Knight SMG RX-1 Rail Gun PLAS-1 Scorcher LAS-16 Sickle AC-5 Arc Shotgun
FLAM-24 Pyro AR-20L Justice DBS-2 Double Freedom SMG-34 Ninja M2016 Constitution LAS-12 Tanto
PLAS-3 Singe AR-14D Paragon LAS-13 Trident
Heavy Weapons

MG-94 Machine Gun MGX-42 Machine Gun AC-22 Dum-Dum LAS-98 Laser Cannon FLAM-40 Incinerator TOX-13 Avenger

Obliterator Grenade Launcher MLS-4X Commando RL-112 Recoilless Rifle EAT-17 REC-6 Demolisher M-25 Rumbler

Supply Stratagems

Resupply REP-80 AD-289 Angel AD-334 Guard Dog LIFT-850 Jump Pack Resupply Pack SH-20 Shield Generator Pack SH-32 Directional Kinetic Shield

MG-94 Machine Gun MGX-42 Machine Gun AC-22 Dum-Dum LAS-98 Laser Cannon FLAM-40 Incinerator TOX-13 Avenger Obliterator Grenade Launcher MLS-4X Commando RL-112 Recoilless Rifle EAT-17 REC-6 Demolisher M-25 Rumbler

EXO-44 Walker Exosuit EXO-48 Obsidian Exosuit EXO-51 Lumberer Exosuit M5 APC M5-32 HAV TD-110 Bastion MC-109 Hammer Motorcycle

Defensive Stratagems

A/AC-6 Tesla Tower A/GL-8 Launcher Turret A/MG-11 Minigun Turret A/RX-34 Railcannon Turret Airdropped Anti-Personnel Mines Airdropped Stun Mines Anti-Personnel Barrier AT-47 Anti-Tank Emplacement Distractor Beacon Humblebee UAV drone Thunderer Smoke Round

Offensive Stratagems

Airstrike Close Air Support Heavy Strafing Run Incendiary Bombs Missile Barrage Orbital Laser Strike Railcannon Strike Shredder Missile Strike Sledge Precision Artillery Static Field Conductors Strafing Run Thunderer Barrage Vindicator Dive Bomb

Special Stratagems

Emergency Beacon ME-1 Sniffer Metal Detector NUX-223 Hellbomb Reinforce