Giant ram's horn
Ram's horns serve the purpose of allowing adventurers of at least level 20 to shout a message to everyone within earshot of this audible channel, assuming they have the requisite 100 gold.
One will find ram's horns scattered across Achaea. They can generally be located on mountaintops or cliffs, although there are some exceptions. Some of the more popular locations for horns include the Vashnar Mountains, the Granite Hills, the cliffs near Riparium, the Mhojave Desert, the Underworld, and the Shrine of Ascension, amongst other places.