Uhm...I was suggesting a new way to approach it and seeing what others thought...
So, basically, a power with the Hit-Effect: Stunned (save ends)? Well, it might work as a encounter or daily power.
You have to compare it to any basic attacks (deal weapon damage + ability modifier) and bullrush (requires attack, if successful pushes target 1 square).
It is difficult to find a power that comes close to what you describe.
Otililuke's Resilient SPhere is a level 15 daily Wizard Attack Spell and lets you immobilize a foe and make him unable to attack anyone outside the sphere. It lasts as long as you sustain it, though
Infernal Moon Course is a level 7 encounter Warlock (Iinfernal) Attack spell. It immobilizes the target 5 feet off the ground until the end of your next turn.
Powers that take any opponent out of the fight are rare. The goal was to ensure that a player could always do something about his situation (in the worst case - aside from death - it's just rolling a save, but as I said, that case is rare).
If you want to continue to discuss this, I suggest forking the thread, since it leads us off-topic.
