Best must-have DLCs

What is a DLC that you consider a "must have" add-on? For me, it's:

• AC Origins' Curse of the Pharaohs - it's incredible!
• Mechwarrior 5 Mercenaries' HotIS, LotKL and RoR are essential: fleshing-out the sim experience approaching PC mod versatility!
• AC Odyssey's Fate of Atlantis (1-3) - it's a whole new game in scope!

What are other great DLCs that are out there?