Blood Leech

Amphibious. The leech can breathe air and water.

Spider Climb. The leech can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Bite. Melee Weapon Attack: +2 to hit, reach 5 ft., 1 target. Hit: 2 (1d4 ) piercing damage, the leech attaches to the target. While attached, the leech doesn't attack. Instead, at the start of each of the leech's turns, the target loses 2 (1d4) hit points due to blood loss. If it stays attached for 3 turns, it will start Burrowing. To remove the Leech the target must make DC 10 STR saving throw, on a success the Leach is removed, on a failer, the Leach is still removed but the target takes 1d6 piercing damage.

 Burrow: Hit: If a Leach has been attached to a target for 3 turns then it starts to burrow, (3) 1d6 piercing damage at the start of each of the leach's turns.

Leaping Attack. The Leach launches itself towards a target with a range of 20ft, the target must make DC 15 DEX saving throw, on a failure the target takes 1d6 piercing damage and the leach is attached.