- "Nothing kills a Guardian faster than another Guardian."
- — The Drifter
Malfeasance is an exotic Hand Cannon introduced in Forsaken and obtainable through the Seething Heart Quest. When an enemy is hit with shots, the slugs in the target all detonate, causing massive damage to the target, as well as a smaller amount of damage to surrounding enemies. 
The Quest is triggered by defeating the Ascendant Primeval Servitor, a Chimera that appears randomly as a Primeval boss in Gambit. It will drop a Seething Heart which needs to be brought back to The Drifter, who will send them to the Dreaming City to kill 25 Taken bosses or yellow-bars. The entrance to the Blind Well is a good place for this, as the Taken and the Scorn will constantly move against each other.
The next step is a mission version of the Strike The Corrupted with a recommended Power level of 580. The player will head to Callum Sol's Grave to obtain a Depleted Weapon Core, which will start the next step when brought back to the Drifter.
The next step requires the player to win Gambit matches and deposit motes. However, dropped motes will subtract x2, so the safest strategy is to frequently deposit only a few at a time, to avoid the risk of exposure to invading rivals or being slain by dangerous hostiles while carrying motes.
The last step requires the player to defeat 25 opposing Guardians, either by invading the other side or killing an invading enemy, and defeat 4 opponents during a single invade. This step can be completed by either themselves or a teammate, but requires three team wipes from a teammate instead of 1. When both tasks are completed, the Malfeasance will be rewarded when visiting the Drifter again.
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.
Explosive Shadow: Shoot tainted slugs that burrow into the enemy. Stacking enough slugs causes them all to explode.
Corkscrew Rifling: Balanced barrel. • Slightly increases range and stability • Slightly increases handling speed
Extended Mag: This weapon has a greatly increased magazine size, but reloads much slower. • Greatly increases magazine size • Greatly decreases reload speed
Taken Predator:Bonus damage against Taken enemies and Gambit invaders.
Heavy Grip: This grip is weighted for recoil control. • Increases stability • Decreases handling speed
Tracker Disabled: No tracker is displayed on this weapon.
Kill Tracker: This weapon tracks the number of enemies you defeated with it.
Crucible Tracker: This weapon tracks the number of Crucible opponents you defeated with it.
List of appearances