This might be common knowledge to the people who did this quest already, but nonetheless I'm posting it to let everyone know.
So you're at the last part of your Destiny Quest level 80 (Defeat the Grim Grey God, objective), you might or might not have a hard time killing the waves of mobs, well here's a trick. All the tombs that gives you buffs, stack, so everytime you've went up and clicked one of the totems, you can get another pair of buffs, I ended up having 254% piercing, slashing and crushing resistance, which basically means you get life when hit by that type of damage. This makes the quest that much easier.
Hope somebody found this useful, enjoy!![]()