Karune: Neither the Immortals nor the Reapers can attack air units. Immortals are currently awesome counters to any high damage unit, and are able to be countered well by any type of rapid attacking unit, such as Zerglings or M&Ms with Stim. The Immortals’ bonus damage against armored add to their ferocity against many Terran units going into Tier 2 and beyond. Nonetheless, bringing in Terran Banshees will ruin any players’ day who masses Immortals.