The Scourge's projectiles explode upon contact, and allows Firestorm to be equipped to increase the blast radius, although it will only increase by ~1 meter.
The Scourge's alt-fire is a hurling move that sends the weapon towards enemies, impaling enemies along its path with physical damage and inflicting a large AoE that inflicts Corrosive damage on enemies as well as causing small Bullet Attractor-like fields to appear on their heads.
Bullets fired at enemies will be drawn to the head. This does not guarantee a headshot.
Bullet Attractor-like debuffs will be applied in pulses, while The Scourge stays in place, there is a bit of a pause between their expiration and the next pulse.
Naturally, Knell will benefit greatly from the Scourge's alt-fire effects as it will easily gain its "Death Knell" buff.
Dual Toxocyst will benefit from the alt-fire for the very same reason.
With its innate Corrosive damage that is effective against heavily armored targets like the Grineer, it is possible to add two more elemental damage types to maximize its status-based damage potential (such as adding Gas damage against the Infestation — and to some extent, against other enemies because of its Toxin gas procs — and Magnetic damage against Corpus robotics to make Scourge a versatile weapon against most enemy types).
The above Corrosive-Gas-Magnetic build on the Scourge is found to be surprisingly effective at dealing with Nullifier Crewmen, as the procs can bypass through the nullifier bubble and deal direct damage on the crewmen themselves (this was tested on a lvl100 Nullifier Crewman in the Simulacrum).
Primary fire bypasses Frost´s Globes from both sides.
A Scourge refers to a whip with multiple thongs or "tails" (a Cat o' nine tails being a good example), and was often used for corporal punishment as well as for self-flagellation by religious penitents. In contemporary terminology, the term has been applied to people, groups, or events that resulted in great calamity.