Isilla card :S

[azurerogue]

Here's the script for Isilla:

{ bonus bInt,2; bonusautoscript "{ specialeffect2 EF_SUFFRAGIUM; sc_start SC_FASTCAST,5000,50; sc_start SC_INCFLEE,5000,30; }",50,BF_MAGIC; },{},{}

When it activates, you have 50% cast time and +30 Flee for 5 seconds. The chance is right before the BF_MAGIC statement. Fireblend's 10% chance is listed as "100," so "50" would indeed be 5% of the time when you perform a magic attack.