Control Magic is a magic based skill that prevents your spells from hitting your allies. This also applies to many types of spell-like effects and Special Actions, such as the blast of a grenade. When Control Magic takes effect, you will see the message "the (name of effect) passes through (character name)" and the character will not take damage. The only way to train control magic is to actually have your allies in the area of effect of a spell or ability. You train the skill more quickly if you have more allies in range.