Malfeasance is a taken themed fast firing hand canon that does more damage to taken and invaders, it also has a perk that if you land five shots on an enemy the thorns it shoots out will all detonate dealing damage.
you can get this hand canon from a quest that you get from killing this giant abomination
once you kill it you’ll get a seething heart from it once you got it take it to the drifter, you’ll have to kill 25 taken bosses or mini bosses. once you’re done with that you’ll have to complete the corrupted mission with a 580 light recommendation so good luck.
after that you need to speak to the drifter and then you’ll need to get motes and gambit wins. once you’re done you’ll need to kill enemy players in gambit and kill four of them in a single invade or have an ally do it for you three times and once you’re done you’ll finally get the malfeasance from the drifter.
Destiny 2 