Dire Beast will summon Hati or Fenryr at 8 stacks.
Summoning a Dire Beast 8 times sounds the Horn of Valor, summoning either Hati or Fenryr to battle.
Hati
Increases the damage of all your pets by 4%.
Fenryr
Pounces your primary target, inflicting a heavy bleed that deals 280 damage over 8 sec and grants you 4% Haste.