Stirge

-1 to hit. Hit: -1 (1d4 - 3) piercing damage. The Stirge attaches to the target. While attached, the Stirge doesn't attack. Instead, at the start of each of the Stirge's turns, the target loses 5 (1d4 + 3) hit points due to blood loss.The Stirge can detach itself by spending 5 feet of its movement. It does so after it drains 10 hit points of blood from the target or the target dies.