The Shard of Farosh's Horn is an item from The Legend of Zelda: Breath of the Wild. It can be obtained by striking Farosh's horn with an arrow as the dragon flies over either Lake Hylia or Lake Floria.
2 shards of Farosh's horn are required to upgrade the Champion's Tunic from level 1 to level 2. Shards of Farosh's horn are on the highest tier of cooking ingredients, and cooking any stat-boosting meal with a shard of Farosh's horn guarantees that the effects last the maximum possible 30 minutes. Shards of Farosh's horn sell for 300 rupees each, making farming them one of the fastest ways of earning money; they sell at Kilton's Fang and Bone for 150 mon.