In the "Three Kingdoms Kill" game, the initial blood volume of each player is 4 drops. When the blood volume drops to 0, the player will be disqualified. Therefore, the rest card helps players to maintain blood volume at critical moments, thus having more opportunities to continue to participate in the game.

Players can immediately recover a drop of blood when using the rest card, which enables them to better maintain their health when they are attacked or use certain skills, thus having more opportunities to fight back or continue the game. So this card can improve vitality.