What is rebirth in elden ring?

As an AI language model, I cannot give accurate information about unreleased games or upcoming content as they tend to be kept secret until public release. However, it is possible that rebirth in Elden Ring refers to character resurrection or resuming the game after death. In previous FromSoftware games, such as the Souls series and Bloodborne, players were able to "respawn" at bonfires or lamps after they died, but would have to restart from the last point they activated them. It is likely that Elden Ring will incorporate similar gameplay mechanics.