D&D 5th Edition
Compendium
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Swarm of Bats
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These D&D 5E Free Basic Rules only contain a fraction of the races, subclasses, backgrounds, feats, items, monsters, spells, and other content available on Roll20. Check out the Player's Handbook to add dozens of more player options to the Charactermancer, the Dungeon Master's Guide to expand on the tools available for DMs, and the Monster Manual to add hundreds of more unique creatures (including token artwork) to fight!
Traits
Echolocation: The swarm can't use its blindsight while deafened.Keen Hearing: The swarm has advantage on Wisdom (Perception) checks that rely on hearing.
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 bat. The swarm can't regain hit points or gain temporary hit points.