Shin Okada
Explorer
If I were you I will not make it into an at-will power or an action which anyone can take. Because,
1. If everybody (including monsters) can do it, it will really hurt PCs.
2. If you make it a class's at-will power, it is like creating a new build option of that class. Maybe you need too much play-testing to balance it out.
3. Special Maneuvers need not to be an at-will power IMHO.
4. An encounter power can still be one's "signature" maneuver. He is doing once in every combat.
So, if I were you, I will make it into an encounter power. Maybe an encounter exploit for Fighter or Rogue.
I like the "weaken, save ends" idea. That is simple enough and you don't need to check if a creature has a droppable weapon or not. Some monsters like Ice Archon Frostshaper is using powers with weapon keyword but they can create weapons indefinitely at-will. And Balor is using weapons but It's stats block does not have Equipment like because they are meant to be broken when a Balor dies. Do you really want to check and argue on those factors every-time a PC attempts to disarm his opponent?
Also, "weaken, save ends" power will work well both on armed and unarmed creatures. Just make the flavor of that power says "You will either knock opponent's weapon away or hit an opponent's hand and make it numb for a while" or something like that.
As an encounter power, it can be an ordinary weapon power with damages. "As weaken save ends" maybe too strong as an effect of L1 encounter power, you may lower either attack bonus or damages, or both.
That is just my 2-cents.
1. If everybody (including monsters) can do it, it will really hurt PCs.
2. If you make it a class's at-will power, it is like creating a new build option of that class. Maybe you need too much play-testing to balance it out.
3. Special Maneuvers need not to be an at-will power IMHO.
4. An encounter power can still be one's "signature" maneuver. He is doing once in every combat.
So, if I were you, I will make it into an encounter power. Maybe an encounter exploit for Fighter or Rogue.
I like the "weaken, save ends" idea. That is simple enough and you don't need to check if a creature has a droppable weapon or not. Some monsters like Ice Archon Frostshaper is using powers with weapon keyword but they can create weapons indefinitely at-will. And Balor is using weapons but It's stats block does not have Equipment like because they are meant to be broken when a Balor dies. Do you really want to check and argue on those factors every-time a PC attempts to disarm his opponent?
Also, "weaken, save ends" power will work well both on armed and unarmed creatures. Just make the flavor of that power says "You will either knock opponent's weapon away or hit an opponent's hand and make it numb for a while" or something like that.
As an encounter power, it can be an ordinary weapon power with damages. "As weaken save ends" maybe too strong as an effect of L1 encounter power, you may lower either attack bonus or damages, or both.
That is just my 2-cents.