Ars Magica: GrogsGrogs They are the majority in almost every covenant, and without them things would come to an immediate halt. They spend their lives serving magi, and may lay those lives down to defend them. They are the cooks, servants, warriors, craftsmen, and hunters who keep the Order of Hermes running smoothly. They are the magi's trusted grogs. Grogs have much to offer any saga, from heroic death to comic relief, or even both at the same time. However,