The dragon has Willpower and Body Building 10, which subtracts 100 from the listed success rate of your status effects. So if a low int char uses a stun spell with a listed success rate of 115% it will fail 85% of the time. However if you use spells that decrease Willpower/Body Building (Drain Willpower for -5 Willpower) in in combination with a high int char (19 int for Shocking Touch), you can get a guaranteed success on the negative status effects.
