Rust Monster

Source: System Reference Document 5.0
The text on this page is Open Game Content, and is licensed for public use under the terms of the Open Game License v1.0a.

Rust Monster

Medium monstrosity, unaligned


Armor Class 14 (natural armor )

Hit Points 27 (5d8+25)

Speed 40 ft.


STR DEX CON INT WIS CHA
13 (+1) 12 (+1) 13 (+1) 2 (-4) 13 (+1) 6 (-2)

Senses darkvision 60 ft., passive Perception 10

Challenge ½ (100 XP)


Iron Scent. The rust monster can pinpoint, by scent, the location of ferrous metal within 30 feet of it.

Rust Metal. Any nonmagical weapon made of metal that hits the rust monster corrodes. After dealing damage, the weapon takes a permanent and cumulative −1 penalty to damage rolls. If its penalty drops to −5, the weapon is destroyed. Nonmagical ammunition made of metal that hits the rust monster is destroyed after dealing damage.

Actions


Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 5 (1d8 + 1) piercing damage.

Antennae. The rust monster corrodes a nonmagical ferrous metal object it can see within 5 feet of it. If the object isn’t being worn or carried, the touch destroys a 1-foot cube of it. If the object is being worn or carried by a creature, the creature can make a DC 11 Dexterity saving throw to avoid the rust monster’s touch.

If the object touched is either metal armor or a metal shield being worn or carried, its takes a permanent and cumulative −1 penalty to the AC it offers. Armor reduced to an AC of 10 or a shield that drops to a +0 bonus is destroyed. If the object touched is a held metal weapon, it rusts as described in the Rust Metal trait.

Source: Pathfinder Roleplaying Game Bestiary.

Of all the terrifying beasts an explorer might encounter underground, only the rust monster targets that which the average adventurer values most: his treasure.

Typically 5 feet long and weighing almost 200 pounds, the lobster-like rust monster would be frightening enough even without the alien feeding process that gives it its name. Rust monsters consume metal objects, preferring iron and ferrous alloys like steel but devouring even mithral, adamantine, and enchanted metals with equal ease. Any metal touched by the rust monster’s delicate antennae or armored hide corrodes and falls to dust within seconds, making the beast a major threat to subterranean adventurers and those dwarven miners who must defend their forges and compete for ore.

Though rust monsters have no innate tendency toward violence, their insatiable hunger leads them to charge anything they come across that bears even trace amounts of metal, and any resistance is met with unthinking savagery. It’s not unheard of for rust monsters in metal-poor areas to track escaped victims for days using their scent metal ability, provided the victims retain intact metal objects. Fortunately, it’s often possible to escape a rust monster’s attentions by throwing it a dense metal object like a shield and running in the opposite direction. Those who frequent areas infested with rust monsters quickly learn to keep a few stone or wooden weapons close at hand.