I'm assuming we all have the same level 70 story mode mission. We have to defend trinity keep or whatever. Anyone beat this because it's bugged so bad that I can't even finish it.
There's a workaround. Once you get to the part where you need to retake the docks run past the harpies and pull and kill the undead with the yellow names one by one. Don't attack the ones with white names, they're not necessary and they come as a group.
Don't bother, once you complete this one (if you're interested in wasting all that time) there's another bugged story mode event where a guy won't give you an item you need.