monster

Rust Monster

CR 1/2

Medium Monstrosity, Unaligned

Reveal Stat Block

Armor Class

Hit Points

33 (6d8 + 6)

Speed

40 ft.

str

dex

con

int

-4

wis

cha

-2

Traits

Iron Scent.The rust monster can pinpoint the location of ferrous metal within 30 feet of itself.

Actions

Multiattack.The rust monster makes one Bite attack and uses Antennae twice.

Bite.m 3, reach 5 ft. ({@damage 1d8 + 1) Piercing damage.

Antennae.The rust monster targets one nonmagical metal object—armor or a weapon—worn or carried by a creature within 5 feet of itself. dex 11, the creature with the object. The object takes a -1 penalty to the AC it offers (armor) or to its attack rolls (weapon). Armor is destroyed if the penalty reduces its AC to 10, and a weapon is destroyed if its penalty reaches -5. The penalty can be removed by casting the {@spell Mending|XPHB spell on the armor or weapon.

Destroy Metal.The rust monster touches a nonmagical metal object within 5 feet of itself that isn't being worn or carried. The touch destroys a 1-foot Cube [Area of Effect]|XPHB|Cube of the object.

Reactions.Reactions the creature can take:

Reflexive Antennae.An attack roll hits the rust monster. {@actResponse The rust monster uses Antennae.

Rust Monster

Corrosive, Equipment-Eating Scavenger

Rust monsters roam the Underdark searching for ferrous metal. When they find this material—whether natural veins, subterranean structures, or creatures' equipment—these beetle-like scavengers rush to feed. Using their feathery antennae, rust monsters dissolve metals such as iron and steel into rusted scrap. They easily gnaw through this corroded metal using their mandibles. Rust monsters usually ignore creatures without metal equipment, but they defend themselves if attacked.