Swarm. The corrosive 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.
Iron Scent. The Corrosive swarm can pinpoint, by scent, the location of ferrous metal within 30 feet of it.
Rust Metal. Any nonmagical weapon or armor made of metal that hits or is hit by the corrosive swarm corrodes. After dealing damage, the weapon or armor takes a permanent and cumulative −1 penalty to damage and Armor class. If its penalty drops to −5, the weapon or armor is destroyed. Nonmagical ammunition made of metal that hits the corrosive swarm is destroyed after dealing damage.
Corrosive Surge. Melee Weapon Attack: +5 to hit, reach 0 ft., one target in the swarm's space. Hit: 8 (3d4) piercing damage and 7 (2d6) acid damage, or 5 (2d4) piercing damage and 4 (1d6) acid damage, if the swarm has half of its hit points or fewer.
Description
A corrosive swarm is a gaggle of hatchlings of rust monster eggs that have hatched, usually, these swarms have been known to be almost the survival of the fittest, and ones that grow past these swarms can grow into fully fledged rust monsters and later rust monster matrons and soldiers. these swarms of hatchlings go after and devour any and all ferrous materials in the hopes of growing, and since they cannot control themselves they spew acidic spittle that is harmful to the skin and ferrous armor and weapons.
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