borderlands
Example of an explosive elemental weapon

Example of an explosive elemental weapon

Explosive weapons' bullets have a chance to explode on impact, dealing bonus damage directly to its target and in an area around its blast radius.

Unlike other elemental attacks, explosive weapons never deal damage over time. All possible damage is inflicted immediately.

Borderlands

Effectiveness

Explosive weapons are equally effective against any and all enemy types: flesh, shielded, and armored (although armored targets will still receive damage reduction, just as they would against any regular attack).

Notes

Borderlands 2

Explosive weapons have been somewhat limited as an element, with most other manufacturers not producing explosive weapons as standard (save for certain Torgue-barreled weapons or any non-elemental rocket launcher), however, the majority of Torgue munitions will carry explosive elemental tech as standard.

Splash damage

A certain percentage of the weapon card damage is dealt in a small area around the impact point, depending on the weapon type:

A direct hit with an explosive round will inflict both impact damage and splash damage on the target. However, splash damage cannot score critical hits and is not boosted on one even if the weapon is capable of inflicting such hits.

Certain weapons, notably assault rifles with the Torgue barrel (Rocketeer/Torpedo/Rokets!/Cannon/KerBlaster/Peak Opener/Boom Puppy/Bearcat/Grenadier), only inflict splash damage.

Additional splash damage is usually not listed on their item card, so their potential damage cannot be taken at face value unless the weapon specifically does splash damage only.

Effectiveness

Explosive damage is fully effective against flesh and armor, but only inflict 80% damage to shields.

Splash explosive damage has the same effectiveness on flesh, shields and armor as the impact damage.

Splash Damage only (cannot crit):

Direct Hit Damage (Impact + Splash) in non-critical spot:

Critical Direct Hit Damage can be calculated as following:

Total Damage = ((impact damage * crit multiplier) + weapon-specific splash damage) * (1 - target specific damage reduction)

Example: An assault rifle listed as doing 200 damage will deal 200 explosive damage on impact and 180 explosive splash damage. If the round hits a critical location, only the 200 damage is multiplied. If the target is shielded, both the impact damage and splash damage are reduced to 80% effectiveness (160 and 144, respectively).

Borderlands: The Pre-Sequel

Explosive damage remains unchanged from Borderlands 2, but has new synergies with the Cryo element:

Borderlands 3 and Subsequent Games

Beginning with Borderlands 3, explosive no longer counts as a separate element, and is replaced by splash damage, which can be any element, and non-elemental "kinetic" damage.