Benefit

Each time you cast a spell that requires a target to make a saving throw, that target gains a battle magic tactics token after the spell resolves. A creature gains a token whether the creature succeeds or fails, but a creature that avoids a spell through spell esistance does not gain a token. Each battle magic token imposes a cumulative -1 Penalty on saving throws against the spells of spellcasters who have this feat. At the end of the round all battle magic tactics tokens dissapear.