Hunting Horn

[Dew]

Initially, the Hunting Horns were far weaker than the Hammer, as per the damage formula, even on those attacks which the two appear to share, such as the Superpound (Triangle+Circle) on the Hunting Horn. What makes the Horn different from the hammer is the Recital ability which is triggered by pressing the "R" button.

As of Portable 3rd, the damage formulas have been changed and the Hunting Horn actually puts out more sustained damage than the hammer. The hammer still does more burst damage and more KO damage but the HH's sustained is far superior. Also in 3rd the forward stab (done by pressing Select) can actually cut a tail.

Each Horn has a different set of three color specific notes.These notes can be combined in various ways to create various effects, which mimic items such as Demondrug and Psychoserum, among others.

Information from the Monster Hunter Wiki