Stinging Tentacles. The swarm extrudes stinging tentacles into the water throughout its space and in a 5-foot radius around it. The tentacles remain active for 48 hours after they are detached from the swarm or the swarm dies.
Any creature that enters that area or starts its turn there must make a DC 15 Dexterity saving throw, with disadvantage if they are surprised by the swarm. On a failed save, the creature takes 14 (4d6) poison damage, or 7 (2d6) poison damage if the swarm has half of its hit points or fewer, and is grappled (escape DC 0). Any attempt by the creature to escape the grapple causes a number of the swarm's tentacles break off and cling to creature.
A creature grappled by the swarm or that has broken tentacles clinging to it takes 14 (4d6) poison damage, or 7 (2d6) poison damage if the swarm has half of its hit points or fewer, at the start of each of its turns. Broken tentacles can be scraped off with a successful DC 10 Dexterity check. A creature takes 14 (4d6) poison damage, or 7 (2d6) poison damage if the swarm has half of its hit points or fewer, if it successfully scrapes off the tentacles or if it tries and fails. Pouring vinegar on the clinging tentacles instantly kills them, causing them to slide off without causing any further damage.
Each time creature takes poison damage from this trait, it must succeed on a DC 10 Constitution saving throw or be poisoned. A creature is paralyzed while poisoned this way. The poisoned creature can repeat the saving throw at the end of each of its turns, provided it hasn't taken poison damage from this trait during its turn. On a success, the poison ends.
Swarm. The swarm can occupy another creature’s space and vice versa, and it can move through any opening large enough for a Tiny jellyfish. The swarm can’t regain hit points or gain temporary hit points.
Transparent. Even when the swarm is in plain sight, it takes a successful DC 15 Wisdom (Perception) check to spot the swarm while it is underwater. A creature that tries to enter the area of the swarm's stinging tentacles while unaware of the swarm is surprised by the swarm.
Water Breathing. The swarm can breathe only underwater.
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