Penitence(not exactly single target, but good as)? Boulder Roll(also)? Pounce?
Also, I'm proposing a change to uproot, if you haven't picked up on that. That means that some things won't, you know, stay the same? And if it's gonna be 2 second duration, Compost isn't adding 600 damage...
"Immobilizes target for 2 seconds(100% speed decrease) and stuns as an interrupt."
Well. -100% speed doesn't actually immobilize the target since that hits the snare cap. I was assuming you meant it would be an actual stun, unless Uproot had special "rules" when it came to snares. You also did say "and stuns" >> I assumed you were saying
"Lets give Queen a 2 second ranged stun at level 1 that does damage!"
Sure, if you make it only 2 seconds, compost would add only 120 damage but I was under the assumption that you wouldn't want to make one of Queen's skill lines even more useless.