Commander's Strike
At-Will * Martial, Weapon
Standard Action Melee weapon
Target: One Creature
Range: Melee
Effect: An ally of your choice makes a Basic Melee Attack against the target. On a hit, the ally deals extra damage equal to your Intelligence modifier.
This language made me puzzled for an instant. "How so one single hit?!" Then I realized there was more, below.Attack: Strength vs. AC (melee; main weapon and off-hand weapon) or Dexterity vs. AC (ranged), two attacks. If you attack one target and both attacks hit, resolve them as a single hit.
The problem really is all static damage bonuses, not just the ability score modifier (which doesn't actually apply to twin strike in the first placeThis language made me puzzled for an instant. "How so one single hit?!" Then I realized there was more, below.
Perhaps it would be clearer to say outright what your purpose is, which also cuts down on the verbiage?
Attack: Strength vs. AC (melee; main weapon and off-hand weapon) or Dexterity vs. AC (ranged), two attacks. If you attack a single target and both attacks hit, you only get to add your stat to damage (Str or Dex) once.
Eh, personally I wouldn't feel bad if Twin Strike and other multi-attack powers were all just limited to one target and added 1[W] per attack roll that succeeds. Yeah, its nice that rangers can hit 2 targets, but its just overly abusable and not really a necessary core capability of the class. The problem with restricting it ONLY in the case of attacking one target vs two is that the vast majority of the time there are already 2 decent targets and players would simply never use it on one target, so the adjustment would be practically meaningless.
Leave multi-targetting to controllers where it belongs.