Aswang

Shapechanger. The aswang can use its action to shapechange into a Small or Medium humanoid it has seen, or back into its true form. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn't transformed to accomodate its new size or shape. An aswang reverts to its true form if it dies.

Ambusher. When the aswang hits a creature with an attack against a surprised creature, the attack is an automatic critical.

Sunlight Sensitivity. While in direct sunlight, the aswang has disadvantage on attack rolls, as well as on Perception (Wisdom) checks that rely on sight.

Multiattack. The aswang makes two claw attacks or one blood drain attack.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (3d6+3)

Blood Drain. Melee Weapon Attack: +5 to hit, reach 15 ft. The aswang's retractable proboscis shoots out from its mouth toward a target. Hit: 7 (1d8+3) piercing damage and the aswang attaches to the target. While attached, the target is considered grappled. Also while attached the aswang can choose to use its blood drain ability as a bonus action on subsequent turns and without making an attack roll. When used in this way the blood drain attack deals 9 (2d6+3) piercing damage to the target, and the aswang gains half as many hit points. The target may use its action to make a DC 14 Strength (Athletics) check to detach the aswang. While attached the proboscis has an AC of 10, and 5 (1d6 +2) hit points. If the proboscis is severed while attached to a target the aswang suffers 1d10 piercing damage from blood loss, and immediately attempts to flee. Also, if a creature is moved more than 20 feet away from the Aswang, the probscis detaches from the target. A creature that dies from the blood drain ability will rise as a zombie 24 hours later, but a remove curse spell can prevent this. A severed proboscis will regrow after 1d6+4 days.