Home >Game Mastering >Bestiary >Creatures by Type >Aberrations >

Rust Monster

Rust Monster CR 3 (Combatant)

XP 800
N Medium aberration
Init +4; Senses blindsense (metal scent) 90 ft., darkvision 60 ft.; Perception +8


HP 40
EAC 14; KAC 16
Fort +5; Ref +5; Will +4


Speed 40 ft., climb 10 ft.

Melee antenna +11 (disarm plus rust), or bite +11 (1d6+4P), or tail +11 (1d6+4B, critical knockdown)
Offensive Abilities rust


Str +1; Dex +4; Con +2; Int -4; Wis +1; Cha -1
Skills Athletics +13, Stealth +8, Survival +8
Other Abilities tracking (metal scent)


Antenna Disarm (Ex)

The rust monster attempts to disarm a metal item a creature is holding using its antenna. On a success, the item also is subject to the rust ability.

Metal Scent (Ex)

This ability functions the same as the scent ability, except that the rust monster can only use it to sense metal objects (including creatures wearing or carrying metal objects).

Rust (Ex)

A rust monster’s antenna causes metal to rapidly rust and corrode, dealing 2d6+4 points of damage to a metal object (doubled on a critical hit), ignoring its Hardness.


Environment underground
Organization solitary, pair, or nest (3-10)

A rust monster is a magical breed of giant insect that evolved in the depths of the world. They have a taste for metal and seek to consume it. The long antennae of a rust monster quickly corrode any metallic object they touch.

Rust monsters combine the appearance of fleas and termites. They have a long tail ending in a forked spade. An adult rust monster is 5 feet long and weighs 200 pounds (20 bulk).

Section 15: Copyright Notice

Starfarer Adversaries: Legacy Bestiary © 2020, Rogue Genius Games LLC; Author: Jacob E. Blackmon; Additional work by: Owen K.C. Stephens. Produced by Owen K.C. Stephens.