Rust Monster
5emedium monstrosity, unaligned
STR
13 (+1)
DEX
12 (+1)
CON
13 (+1)
INT
2 (-4)
WIS
13 (+1)
CHA
6 (-2)
Defense
Armor Class
14 (natural)
Hit Points
27 (5d8+5)
Speed
40 ft.
Proficiencies & Senses
Skills
Perception +3
Darkvision
60 ft.
Passive Perception
13
Traits
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.
Reference Text
A rust monster is a medium, insectoid creature with a spiny, armored body and prominent antennae that rust and corrode metal.