In Battle for Azeroth, the major expansion for World of Warcraft, patch 8.3 is the last major update and will bring us another new raid, Ny'alotha. Blizzard is bringing a new raid with each major expansion, and the matching Full Gear.
Full gear is a must in WoW, because it's the best you can get from the raid. Each raid has its own Full Gear and as always, it is divided into three levels of difficulty. They are available in Normal, Heroic and Mythic. The Full Gear that is most important for you is the Mythic Full Gear. With it, you'll be able to compete anywhere in Azeroth, whether you want to go into the arena or just have fun with PvE. The Mythic Full Gears are the best there is and probably the hardest to get.