Zehtuka's Great Horn

Zehtuka's Great Horn is a quest item found at a shrine at the center of the Crystal Overlook.

Most likely it belongs to The Great Zehtuka.

This item stacks.

If you are carrying this item when you defeat The Great Zehtuka in The Norn Fighting Tournament, he will take it from you, and replace it with Zehtuka's Horn, a Green Focus Item that is automatically customised for the character receiving it.

Location
A map to Zehtuka's Great Horn can be found here.