Warhammer: Vermintide 2

The end fight should be the only difficult part if you're running with a group. Be sure to collect all the skulls as you progess throughout the level; not only is this an achievement by itself, it unlocks the gates in the boss room, which are full of ammo and potions. After you deposit each barrel, bring your team into any one of the unlocked rooms. In here, you can't get hit by the spinning walls of damage that sweep the entire arena! I'm not sure if this a bug, or whether it's intentional, but we did this 3 months after the DLC released and it worked fine. Look out for Globadiers as they can potentially mess things up, but otherwise, these rooms are great holdout spots while you wait for the next barrels to spawn in.