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The MHW majestic horn is a rare item needed to level up and craft some of the game's highest level gear and armour. The item is tough to find, with it found only through defeating one particular enemy type. The rarest items to find in Monster Hunter World (MHW), such as the warped bone and wyvern gem, are the most valuable and functional. To obtain the majestic horn, you need to defeat and break the horns of a high-rank Diablos, which is considerably more powerful. The majestic horn can be used to forge high-level armour and weapons.