Humm Kisa, if you are willing to, can you please gather the following numbers? Anyone else can too.
First off take off you staff.
Also have a few swords at hand with various ap. Some ma acessories may help.
Anyways start off by recording you ma and ap and skill level.
Now use the skill on a torrobie and note the damage (make sure it is not a crit)
Next cast mist of mana and then record your ma, ap and damage.
Now switch maps to remove the mist buff and put or your first sword. Record you ap and cast the skill with and without mist taking note of the damage.
Do this with two more swords with higher ap.
Also make sure LK and ac do not affect the damage.
Anyways, +rep to everyone who does this. (if that is an incentive). I hope this is somewhat clear.