Originally Posted by
Dyslexic-Snail
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The hardest open world boss has to be
Jacks and his shield. We had a good battle of the shields when I was using one but even without one he is still b*tch to kill. I was messing about with a skill build and a shield, it was a great battle but only because I finally killed him.

It's not the most difficult, once you have a strategy... mine is (in spoiler tags in case you don't want to read and figure a strategy for yourself):
Spoiler: Show
You basically need to make him plant his shield in a position where you can hit the red ammo pouch attached to his backpack from a position of cover. A few hits to it, it starts detonating, Jack start flailing his arms, and is completely vulnerable. This is easily done if you approach from the south, take cover on the left of the street, soot at him, kill the mobs, while every so often shoot at Jack so he won't move, then once you killed all the mobs, just go to the right, around the truck parked on the corner, hit the ammo box on the backpack, then wail away.
The most annoying boss for me is Chains, since I play solo, and there are many, many mobs that can be aggro'd from very far.
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