HolyMan
Thy wounds are healed!
Knew he was going to ask LOL 
4 points = 1d12 per 2HD maximum 120'(cone/line), DC 10 +1/2 hit dice +Con mod., usable every 1d4 rounds.
5 points = 2d8 per 2HD maximum 150'(cone/line), DC 10 +1/2 hit dice +Con mod., usable every 1d4 rounds.
Trying to keep in thirds as much as possible, but some of the dice/numbers would seem odd. 5 points for a 20d8 attack feels right, you would be missing +10 to a stat or five at will powers.
HM

4 points = 1d12 per 2HD maximum 120'(cone/line), DC 10 +1/2 hit dice +Con mod., usable every 1d4 rounds.
5 points = 2d8 per 2HD maximum 150'(cone/line), DC 10 +1/2 hit dice +Con mod., usable every 1d4 rounds.
Trying to keep in thirds as much as possible, but some of the dice/numbers would seem odd. 5 points for a 20d8 attack feels right, you would be missing +10 to a stat or five at will powers.
HM