Gjallarhorn - Defender of Two Worlds

Named for a mythical battle horn whose blast could "be heard in all worlds' and decorated with an elaborate web of iron wyrmwings and pair of all-seeing eyes, this compact firearm is another relic from an age in which man and dragon put their differences aside to live together in harmony. Why such a powerful weapon was needed in a time of peace is a question that may never be answered (Encyclopedia Eorzea)