As a warrior, on elite bosses your job is to tank and make sure the boss hits you instead of the rogues and mages -- this will allow the rogues and mages to kill the boss quicker if they don't have to worry about being 1-shot.

It seems this has become a big problem in AL. Warriors seem to not want to tank anymore, and as mage I don't even like doing runs with them anymore, I just prefer rogues. Because whether or not the warrior is there, I always become the primary target of the boss. At least with rogues there we can finish off the boss quicker so I don't have to use as many pots. Otherwise I will die multiple times at each elite boss.