The use of health points simplifies the game development process (since developers do not need to create complex damage systems), allows computers to simplify calculations associated with the game, and makes it easier for the player to understand the game. However, more complex and realistic damage systems are used in a number of games. In "Dwarf Fortress", instead of health points, dwarves have separate body parts, each of which can be damaged. The "Fallout" games use health points, but allow characters to inflict damage to different parts of the enemy's body, which affects gameplay. For example, if a leg is injured, the character can get a fracture, which will reduce their movement speed, and if their arm is injured, the character can drop their weapon. Health points can also serve as a plot element. In "Assassin's Creed", if the protagonist takes too much damage, thus departing from the "correct" route, the game ends and returns the player to the nearest checkpoint.