Ok, I had a start here a couple of days ago, lost it, and have just been too uninspired to type it in again since. But here goes:
Dancing Frenzy (Ex): A callicantzaros can dance itself into a frenzy. If a callicantzaros spends a move action to make a DC 15 Perform (dance) check, it gains a +1 to attack and damage rolls and an additional +1 for each 5 points the check exceeds DC 15. In addition, the callicantzaros may choose to use its Perform (dance) check result in place of any necessary Reflex save in the same round that it has danced. If a callicantzaros has made a successful Perform (dance) check for three successive rounds, it also gains +4 Str and +4 Con as long as it spends a move action to make a Perform (dance) check. However, each round that it benefits from enhanced Str and Con, it must make a DC 10 Will save or spend its full round dancing without taking any other actions.
Look better?