Yes, I wrote you a note. I want you to burn this in your memory. If you're wielding this gun, I've already told you all this and more. But I want you to keep it fresh in mind. I want you to have this. You may need it. You and I have done a lot together in this system, and I hope and pray we'll get to do a lot more. It'll be a lot safer with you wearin' one of these. It's the culmination of a lot of things. Long time ago I set out to find a replacement for a weapon called Thorn. This will never be that, but to me, it's better. We built it together. And all of us, with this in hand? Even the Man with the Golden Gun should have pause. Maybe we can't out-shoot him. Maybe he can't be out-shot. But if we all take our shot together? We don't have to beat him to it. He'll die, too. Remember this. For when the day comes. —The Drifter
Sources
Malfeasance is an Exotic Hand Cannon that can be obtained in the following methods:
Upgrades
Rat King can also be upgraded with the following perks:
Column 0
Explosive Shadow
Shoot tainted slugs that burrow into the enemy. Stacking enough slugs causes them all to explode.
Column 1
Corkscrew Rifling
Balanced barre
Slightly increases range and stability
Slightly increases handling speed
Column 2
Extended Mag
This weapon has a greatly increased magazine size, but reloads much slower.
Greatly increases magazine size
Greatly decreases reload speed
Column 3
Taken Predator
Bonus damage against Taken enemies and Gambit invaders.
Column 4
Heavy Grip
This grip is weighted for recoil control.
Increases stability
Decreases handling speed
Column 5
Tracker Disabled
No tracker is displayed on this weapon.
Column 6
Crucible Tracker
This weapon tracks the number of Crucible opponents you defeated with it.
Column 5
Default Ornament
Restores your weapon to its default appearance.
Aim to Misbehave
Equip this weapon ornament to change the appearance of Malfeasance. Once you get an ornament, it's unlocked for all characters on your account.