Actions

Blood Drain .
Melee Weapon Attack : +5 to hit, reach 5 ft., one creature.
Hit : 5
(1d4 + 3) piercing damage, and 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.
A creature, including the target, can use its action to detach the stirge.