Destiny 2: Absolutely Stunning Seasonal Quest solo easy mode
Load into this week's (week of Aug 29th 2023) Empire Hunt "The Warrior" on Master mode. You will have two OL champs, one Vex Minotaur, and one Fallen Captain. Shoot them while they fight each other and an assortment of Vex and Fallen adversaries.
If you don't kill many of the other adversaries, they will remain in their own fight mode and never bother you while you stun them over and over until you get your 50 stuns.
Key is, do NOT kill the OL champs. You just want to stun them over and over.