Critical: 10 points = 10 x 1.5% = 15%, then there is a 15% chance that the attack can be critical, with the calculation for example the Duckie attack is 100, if it became critical, then the damage attack will be 100 x (10 x 150%) = 150 damage. Note that if the attack has an effective or ineffective damage, then the critical effect is applied on the effective attack damage, for example: effective attack damage is 100 then ( 100 x effective(150%) ) x critical(150%) => 150 x 150% = 225 damage.