There should be an option for deathmark and or Vendetta within the Assassination tree.
With Envokers Cauterizing Flame and so many more abilities in the game that removes deathmark in arenas. There should be an option for Vendetta in the Assassination tree.
Assassination 2 minute cooldown “Deathmark” shouldn’t be so easily removed in arenas. Fire mages combustion was changed for this very reason. Assassination should be giving the same treatment.