INTELLIGENCE

The number of targets your area spells can affect is dependent upon your power level, the power level of your victims, your intelligence, and your area mastery.

maximum power levels of area targets =
   (INT / 5 + (area mastery i + ii + iii) / 50) * your power level

For example, a level 125 mage (power level 155) with area mastery i and area mastery ii at 90% each and intelligence of 26, could hit up to:

 (26/5 + (90+90)/50) * 155 = 1364 power levels of targets

Or about 27 level 50 ixies.

The amount of damage you do is also increased by your Area Mastery skills. The amount of damage is increased by ((area mastery i + ii + iii) / 20)%. In our above example, the mage with an Area Mastery total of 180% would do an additional 9% damage to each target.