Amphibious. The swarm can breathe air and water.
Blood Frenzy. The swarm has advantage on melee attack rolls against a creature that doesn't have all its hit points.
Bites. Melee Weapon Attack: +1 to hit, reach 0 ft., one target in the swarm's space. Hit: 7 (2d6) piercing damage, or 3 (1d6) piercing damage if the swarm has half of its hit points or fewer, and the target is grappled (escape DC 10). Until the grapple ends, the swarm can't bite another target, and the target takes 2 (1d4) necrotic damage at the end of each of its turns due to blood loss.
Description
Leeches are aquatic worms known for their diet of blood. Most leeches feed by lurking in murky water and biting onto larger animals that haplessly wander too close. The leech hangs onto its prey using circular jaws, slowly drinking the animal's blood over many minutes, often without the prey even noticing.
While most leeches are usually little more than a nuisance to skilled adventurers, some varieties are large enough or fierce enough to genuinely threaten them. Deadly leeches can swarm in unexpectedly great numbers in places such as dismal swamps, aquatic caverns, cursed lakes, and even rancid sewers. These swarming leeches are so dangerous that they can bleed a knight and their horse to death in less than a minute.
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