“Yes.” Celestia paused to take a sip of her tea, and to gather her thoughts. “It was a herd of earth ponies, back in the pre-unification days. They were called that by the unicorns, because spells just slipped right off of them.” They had been a force to be reckoned with, winning several skirmishes with ease and taking the unicorn garrison at Longeing Cavesson without a single casualty. But then they'd gotten cocky and cruel, breaking the horns of every prisoner, then setting them free to seek salvation at the great fortress at the base of the unicorn mountains. “The concept was adapted into some of the modern guards' armor.”