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Crimson Swarm - AI-generated fantasy Monster

Crimson Swarm

The sect of the Iron Pulse sought a way to monitor the vast reaches of the Undermyr without exhausting their guards. By infusing spider eggs with distilled drow blood and resonant quartz, they created the Crimson Swarms. These creatures are psychically linked to the very stone of the dungeon.

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MediumSwarm(Tiny Beasts)CR MinorUnaligned

Crimson Swarm

SpiderBlood MagicDetectionDrow-Made
HP36AC13SPD30 ft., Climb 30 ft.CR2PerceptionStealth
STR
3
DEX
16
save
CON
12
INT
1
WIS
10
CHA
2
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 spider. The swarm can't regain hit points or gain temporary hit points.
Spider Climb. The swarm can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Sanguine Scent. The swarm has advantage on Wisdom (Perception) checks to locate any creature that does not have all its hit points.
Iron Pulse Resonance. When the swarm takes damage, it emits a high-pitched vibration. The regional Iron Pulse effect intensifies within 300 feet, and all Iron Pulse sentinels in the dungeon are immediately alerted to the swarm's location.
Bites. Melee Weapon Attack: to hit, reach 0 ft., one creature in the swarm's space. Hit: 7 () piercing damage plus 7 () necrotic damage, or 3 () piercing damage plus 3 () necrotic damage if the swarm has half of its hit points or fewer.
Internal Feast. The swarm targets one creature in its space that is below its hit point maximum. The target must succeed on a Constitution saving throw or take an additional 10 () necrotic damage as spiders enter its wounds. The swarm then detaches half of the damage taken from the target's maximum HP until the target finishes a long rest.
Skittering Panic. When a creature moves within 5 feet of the swarm, the swarm can move up to half its speed without provoking opportunity attacks.
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