Hollow Knight
Many areas feature more challenging enemies and bosses which the player may need to defeat in order to progress further. Defeating some bosses grants the player new abilities. Later in the game, players acquire a "dream nail", a special blade that can "cut through the veil between dreams and waking". It enables the player to face more challenging versions of a few bosses, and to break what is sealing the path to the final boss. If the player defeats the final boss of the game, called "The Hollow Knight", they are given access to a mode called "Steel Soul". In this mode, dying is permanent, and if the knight loses all of their masks, the save slot will be reset.