Blood Scent. The swarm can smell blood from up to a mile away. Any creature that has blood and has fewer than half of its maximum number of hit points is considered bleeding.
Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny insect. The swarm can't regain hit points or gain temporary hit points.
Thousand Cuts. Any creature that starts its turn with the swarm in its space must succeed on a DC 15 Constitution saving throw and take 18(4d8) slashing damage on a failure or half as much on a success.
Flutter. Melee Weapon Attack: +6 to hit, reach 0 ft., one target in the swarm's space. Hit: 18 (4d8) slashing damage, or 9 (2d8) slashing damage if the swarm has half of its hit points or fewer.
Description
A swarm of blood-drinking crimson death butterflies, an apex predator within its jungle habitat. The butterflies' wings are magically sharpened to the point of causing severe lacerations on any creature they touch. The swarm usually flies around its prey, causing severe wounds, and then begins to feed on the blood once the damage proves lethal.
Superswarm. As all crimson death butterflies are drawn to the strongest smell of blood, areas with large amounts of it, such as a battlefield or the corpse of a large animal, can sometimes result in what is referred to as a superswarm. A superswarm is considered CR 11, is huge rather than large, and does not have its damage halved at low hit points. When the superswarm is reduced to 0 hit points, it splits into three crimson death swarms at full health.
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