You can kill each of these bosses once per day, per character, for a chance at their loot.
If you are killing all four of these rares daily for a chance at the rep tokens and mounts, here is a script you can use to see if you've already any/all of them:
/run for k,v in pairs({deathtalon=39287, terrorfist=39288, doomroller=39289, vengeance=39290}) do print(format("%s: %s", k, IsQuestFlaggedCompleted(v) and "\124cFFFF0000Completed\124r" or "\124cFF00FF00Not completed yet\124r")) end
You can kill each of these bosses once per day, per character, for a chance at their loot.
If you are killing all four of these rares daily for a chance at the rep tokens and mounts, here is a script you can use to see if you've already any/all of them: