Damage Transfer. While grappling a creature, the swarm takes only half the damage dealt to it (rounded down) and that creature takes the other half.
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 bandage wrap. The swarm can't regain hit points or gain temporary hit points.
Turn Susceptibility. Whenever the swarm fails its saving throw against an effect that turns undead, it takes 16 (3d10) psychic damage.
Undead Nature. The swarm is made of tiny undead that don't require air, food, drink, or sleep.
Grab. Melee Weapon Attack: +4 to hit, reach 0 ft., one creature in the swarm's space. Hit: 10 (3d6) necrotic damage, or 5 (2d4) necrotic damage if the swarm has half of its hit points or fewer. In addition, the target is grappled (escape DC 12) and until the grapple ends the target is restrained and the swarm can't attack another creature. If the target is a creature, it must succeed on a DC 12 Constitution saving throw or be cursed with mummy rot. The cursed target can't regain hit points, and its hit point maximum decreases by 10 (3d6) for every 24 hours that elapse. If the curse reduces the target's hit point maximum to 0, the target dies, and its body turns to dust. The curse lasts until removed by the remove curse spell or other magic.
Description
The desecrated wrappings used to raise a mummy as an undead do not entirely lose their magic when a mummy is defeated. Discarded mummy wraps can move on their own if the mummy's vengeful curse lingers, slithering as they search for those who destroyed the mummy and try to continue guarding the mummy's tomb.
The shreds and discarded wrappings left by a single mummy, even a mummy lord, are rarely substantial enough to form into a swarm. It usually takes multiple destroyed mummies to accumulate into even a single swarm. Multiple swarms can come together in places that used to have dozens of mummies, such as the most elaborate tombs -- after they've been successfully raided.
Swarms of beasts are dangerous enough, but a swarm made of undead can be even more difficult to disperse. Undead can be commanded to swarm, but they usually form swarms as an accidental result of necrotic energy lingering over many scattered remains.
Turning Swarms. Swarms of undead have a special relationship with effects that turn undead. Driving away the undead can cause them to scatter, disturbing the cohesion of the swarm just as damaging the individuals would do. Clerics that turn undead may find the entire swarm routed just as quickly as it appeared, assuming the swarm is made of undead that can be turned.
Undead Nature. These swarms are made of tiny undead that don't require air, food, drink, or sleep.
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