When I came into the Legion hobby I had a lot of confusion regarding many of the rules. One example was the concept of Clambering which I couldn't find online, it was just on some upgrade cards and my physical rule book. Turned out - that was a concept that had been removed from the rules altogether.
— Takras
So to help others to avoid this, coming in to Legion now, after the 2024 rules, I'd make this list of concepts and keywords that are no longer part of the game.
Clone Troopers: Phase I and Clone Troopers: Phase II
Removed from the game. They are now merged into a single unit type called Clone Trooper Infantry. You can still use your existing Phase I and Phase II miniatures as Infantry units.
Removed Units
Emperor Palpatine and Imperial Royal Guard are no longer part of the Star Wars: Legion line are not legal for army building purposes.Pathfinders are also removed from the game. You can use the miniatures as Rebel Troopers.
Removed Cards
Many cards were remove from the game in the July 2024 update, such as the command card Hero of the Clone Wars which was replaced by new 3-pip card: General Skywalker.
Clarification: For a full list of updated and removed cards from the 2024 changes, please click the source for the official PDF.[Source]
Vehicle Disabled and Weapon Disrupted tokens.
Removed from the game. Now only one type of damage matters: the Damaged token.