I don't know how to put it into a formula, but it increases your attack by 25% for 10 mana a hit, so if you arch and you attack for 60, then you'd attack for 75 with 10mp gone. Can be turned on and off, crits has this skill since made, but cannot use till lvl 24.
Edited by Ryuku, 04 September 2004 - 04:41 PM.