M-25 Rumbler

"'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
Players must enter the following sequence, using the controller d&#8209;pad, in order to call down this single-use Stratagem during a mission:

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

Weapon Stats

 * 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.

Gameplay Tips

 * 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.