No game mechanic in Minecraft, Dark Souls, Baldur's Gate 3, etc is new. Their success comes from a well-executed mix of known features. Trying to create a game with a new mechanic is like writing a story with an unknown plot device: theoretically possible but quite difficult and the result likely won't be any better in terms of quality.

Try and name just one game released in the last decade with a completely novel game mechanic.