Yeah, was sad to see that go but absolutely expected it to. They should have held the idea back until they were going to show off what they would do with it: they mentioned the idea that monster powers were basically their critical hits, and that's something that maybe could have made that fly. Also show that you can give monsters way more damage-dealing power when you don't have to worry about a one-term lucky strike to balance around. Other people here mentioning special attacks on a d20 aren't bad ideas, but I'd rather just see monsters get more potential attacks overall than just get a special one once every 20 die rolls.