Rust Monster

Stat block

Cha

6

Con

12

Dex

12

Int

2

Str

12

Wis

12

Speed

Walk: 40; Climb: 20

Senses

darkvision 60 ft., tremorsense 30 ft.

Skills

Actions

• Bite. _Melee Weapon Attack:_ +3 to hit, reach 5 ft., one target. _Hit:_ 8 (2d6+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 DEX save to avoid the rust monster's touch.<br>If the object touched is either metal armor or a metal shield being worn or carried, it 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.

Saving throws

Wisdom: 1; Charisma: -2; Strength: 1; Dexterity: 1; Constitution: 1; Intelligence: -4

Special abilities

• Iron Scent. The rust monster can pinpoint, by scent, the location of ferrous metal within 30 feet of it.
• Monstrosity Resilience. The rust monster is resistant to exhaustion and to the frightened condition.
• 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.
• Spider Climb. The rust monster can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Damage resistances

Monstrosity Resilience