The Chosen Ones

sargaqntans also does something not in description
in chapter 9 i notice this, when im not wearing sargatans my spells only do damage when they hit; when i wear sargatanas this is what happens:
I cast magic hammer, it appears and does huge damage then the anaimation falls stun and damage occurs. Two instances of damage what? tHIS IS THE SAME FOR ALL SPELLS I CAN HEAL MYSELF AND BOOM DAMAGE BIG IN AOE. This does not happen witouth sargatanas. No i am not proccing another item.