Borderlands 4: How to Trigger Endless Explosions with the Waterfall Grenade Mod

Hey everyone, SGZ here from Spartan Game Zone. Today, I’m breaking down an overpowered interaction in Borderlands 4 that lets any Vault Hunter trigger endless explosions—melting bosses in seconds. This build revolves around one legendary item: the Waterfall Grenade Mod. Whether you're looking to dominate endgame content or simply want to buy Borderlands 4 Boosting services to fast-track your gear collection, understanding this explosive combo is key. Let’s get into it.

 What You’ll Need

1. The Waterfall Grenade Mod

Effect: “Causes additional explosions when damaging targets.”

How to Get It: Increased drop chance from Bio Bulkhead, located in the Fade Fields area.

2. Splash Radius Bonuses

This interaction requires increasing your splash damage radius

Sources include:

Firmware: Get Throwing (+20% splash radius per point).

Grenade Mod Augments: Expansive or Nuke variants.

Class Skills: Any talents that boost splash or area-of-effect size.

How the Interaction Works

Normally, the Waterfall grenade causes one initial explosion, plus one additional explosion per enemy hit. However, by increasing your splash radius, you can hit multiple targets—or multiple hitboxes—simultaneously.

If you register enough hits in one throw (at least 6 hits), the additional explosions begin to loop indefinitely, creating a chain reaction that lasts until all targets are dead.

Setup Instructions

Step 1: Maximize Splash Radius

Equip firmware or skills that grant +40% or more splash radius.

Use a Waterfall grenade with the Expansive or Nuke augment if possible.

Step 2: Test in Sanctuary

Head to the shooting range dummies.

Toss a Waterfall grenade near them.

If your splash radius is high enough, you’ll see rapid, continuous explosions.

The loop will continue until you leave the area or all targets are destroyed.

Note: The dummies have multiple hitboxes, making it easier to trigger. In combat, you’ll need several enemies close together.

Using It in Combat

Against Mobs

Throw the Waterfall into dense groups of enemies (6 or more).

The loop will trigger and wipe them out almost instantly.

Against Bosses

Bosses with adds or multiple hitboxes (like Backhive or Vile enemies) are perfect.

Even if it doesn’t kill instantly, the endless explosions will rapidly drain their health.

Avoid using this against Orgo—it can cause inconsistent behavior or game crashes.

Key Insight

The looping explosions do not damage you, only enemies.

On PC, this is very stable outside of Orgo’s arena. Console results may vary.

 Maximizing Damage

Once the loop is triggered, increase its effectiveness with:

Ordinance Damage bonuses

Splash Damage increases

Elemental Damage rolls

Class Skills that boost grenade or explosive damage (e.g., Raptor’s ordinance tree)

Important Notes & Warnings

Game Stability: Triggering too many explosions can push the game engine to its limits and may cause crashes. This is most common in the Orgo boss fight.

Minimum Threshold: You need ~6 hits in one throw to start the loop. Against single targets, this requires multiple hitboxes (like crystals on Vile enemies).

Farm Responsibly: This interaction is extremely powerful. Use it to farm bosses quickly, but be prepared for potential hotfixes or patches.

Summary

The Waterfall grenade mod, combined with increased splash radius, creates one of the most powerful builds in Borderlands 4—reminiscent of the infamous Porcelain Pipe Bomb. It works on every Vault Hunter, requires no specific build, and can delete bosses in seconds. For players looking to quickly master this build or acquire the necessary gear, services like Borderlands 4 Boosting for sale from trusted providers such as MMOEXP offer a great way to fast-track your progress and unleash this explosive potential right away.