All stasis effects work on him, anna’s biotic grenade works on him, chromies trap works on him. Like the dude is suposed to not have anything effect him negative or positive.
He’s not immune to debuffs, he’s only unstoppable. Damage reduction, heal reduction, and time stops have always worked on him and any unstoppable heroes. He only can’t be stunned, silenced, blinded, slowed, or rooted.
Or displaced. Exception of Zagara’s Devouring Maw which can move him a little.
Yes all “Wall” creations (Forcewall, Zombie Wall, Entomb, Loot Hoard, ect.) can displace him oddly but tend to not interrupt anything but movement.