There is a gray box near the medicae just as you enter the ampitheatre at the end of the new Carnival mission, by jumping on a barrel next to it you can vault on top of it. Melee enemies cannot pathfind up it or hit you, making the only threats ranged enemies.
Steps to Reproduce:
Hug the left wall as you enter the final section of the carnival, climb on the barrel shown in the first picture and jump onto the stack of gray boxes.
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