Permadeath

Permadeath is a game mechanic in both tabletop games and video games in which player characters who lose all of their health are considered dead and cannot be used anymore. Depending on the situation, this could require the player to create a new character to continue, or completely restart the game potentially losing nearly all progress made. Other terms include persona death and player death. Some video games offer a hardcore mode that features this mechanic, rather than making it part of the core game.