I am sure you know that there are a lot of chests guarded by strong monsters, sometimes even groups you can't solo(champ+2veterans and so on) and you can't open the chest if they hit you. There are 2 ways to do this as a warrior.
As a Warrior:
1)run to the chest
2)get downed
3)use 2 on the strongest mob, try using 4 to survive
4)target chest, use 3 to get up a soon as it's off CD
5)F to open chest, you are invulnerable for a while
6)logoff
Easier one, might not always work if mobs have CC, also am not 100% sure, haven't tested it much:
1)run to the chest
2) Endure pain
5) F to open chest