kenmarable
Hero
Stolen!!Oh ye of little faith. Here's how I'd do it:
Insect Limbs (thri-kreen racial trait): You have four hands. You can only use two of them at a time; the other two can hold objects but not use them. At the start of each of your turns, choose which two hands you are currently using.
Third Hand Strike (thri-kreen racial encounter power, minor action): Make a basic attack with a weapon or implement held in the hands you are not currently using.
Then throw in some thri-kreen feats that build on the Two-Weapon Fighting feat chain, and maybe a paragon path built around attacking with all four hands at once.
You're probably not ever going to get four attacks a round, every round - though it could be balanced with appropriate to-hit penalties. But multi-limb fighting, sure.
I like these quite a bit. They are useful and definitely relate to having extra arms, but they seem well-balanced for racial traits. I just might have to introduce some thri-kreen into my campaign now.