Witches and warlocks have a lengthy history of using familiars to do battle with one another. Ventdal has made a pact with entities unknown to mankind to protect her servants from attack by any mindless form. If that pact is successfully drawn upon, minions of any type and most undead enemies will deal less damage to the witch being attacked.
iPercentageDecrease = piMinionDamageReduction + iStat/5 + ((piMinionDamageReduction * (iAbility+1))/100);
Current server setting for piMinionDamageReduction is 20. Main stat is Mysticism.
A 99% 50 myst char would therefore see:
20 + 10 + 20 = 50% reduction of damage from minions and undead.