The swarm is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the swarm must succeed on a Constitution saving throw against the caster’s spell save DC or fall unconscious for 1 minute.

While the swarm remains motionless and isn’t flying, it is indistinguishable from an pile or stack of coins.

The swarm can take the Disengage or Hide action as a bonus action on each of its turns.

The swarm can occupy another creature’s space and vice versa, and the swarm can move through any opening large enough for a Tiny creature. The swarm can’t regain hit points or gain temporary hit points.