Here we are going to implement a gameplay ability which allows player to damage and kill other players in the game. As this is a multiplayer game, everything is replicated. So, when the player equip sword and attack other characters in the world, they will receive damage and then when the health drops to 0, they will die. Health is implemented as a attribute in a gameplay attribute set. So we will implement a way to listed to attribute changes in the character blueprint using a callback binding so we can check the health level and kill the character at 0 health.