Rock, Paper, Genocide: Corrosive Weapons! is a mission in Borderlands 2
Turn in: Marcus
And now: Corrosive Weaponry!
Test Marcus's Corrosive Weaponry
Optional Mission: Yes
(Level and Reward based on player's level)
"Now what else - ah Armor! Armored targets, like these damned Hyperion robots, can take a lot of damage... unless you've got a corrosive weapon."
"See how the acid eats through the metal? I must confess - I love corrosive weapons."
Marcus has some corrosive weapons ready for you to try out.
Looks like the corrosive guns work!
Use the Corrosive weapon.
Strategy Guide - Tips - Cheats
Remember the lesson here - Corrosive weapons are great when dealing with armored enemies.