Arena Master's War Horn
Drops from Arena Master's War Horn. There is an entrance onto the balcony around the back of arena at 23, 23
The 
Arena Master's War Horn is a toy found at the Circle of Blood arena in Frostfire Ridge that summons two ogres to fight when looted.
Guide awaiting review
Locate the war horn
Travel to the Circle of Blood arena in Frostfire Ridge and go to the outside of the arena at 23.3, 23.9 to find the war horn object.
Loot the war horn
Interact with the war horn to loot the Arena Master's War Horn, which will summon two ogres that fight for your amusement.
Tips
After obtaining the horn, continue around the arena's perimeter to jump onto a spectator's chair with an umbrella and alcohol for additional entertainment.
A nearby chest at the spectator's chair rewards you with
alcohol and 
Ice Stone.
