I've been doing a lot of testing to determine how damage is calculated in Neverwinter. In old forum threads such as this one: http://nw-forum.perfectworld.com/showthread.php?301761-Calculating-stats-and-their-effects
one of the things that was listed as still needing to be figured out were the coefficients that modify power and weapon damage that go into the spell damage calculation. I haven't been able to find anyone else who did it. So went ahead and did it myself.
The damage calculations for CW abilites all have the same basic form:
damage = C1*(1+(Int-10)/100)*((1+WD*.00846)*(0.9+rank/10)+(Cp*power))
C1 = a constant unique to each ability
Int = The Intelligence of your character
WD = your weapon damage (you can use max, min, or average depending on what you want to know)
rank = the number of times you have upgraded the ability (Rank 1, 2 or 3)
Cp = the power coefficient (varies slightly by ability)
power = your current power (obviously)
Ray of Frost
Conduit of Ice
Ray of Enfeeblement
Shard of Endless Avalanche
Maelstrom of Chaos
Maelstrom of Chaos has its own unique formula which is
I have not investigated Master of Flame abilities.
I've written up a much more thorough post analyzing this and sharing some things I've learned about the game mechanics during testing at the following link. If you're new to the game and want to understand how the abilities work this is for you. Also if you're an old grizzled vet, I'd wager that I dug up a few pieces of information that you didn't know.