After over a decade, Call of Duty has finally returned Grief mode to Zombies with Season 4 of Black Ops 6. Grief is a competitive Zombies mode that was introduced in Black Ops 2, but this new Black Ops 6 version is definitely more complex than the original, so there's plenty of information you'll want to know whether you are a new or returning player. Note: All these info come from U4gm. You...