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.
Pincer. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 5 (1d12 + 1) piercing damage. On a hit, if the creature is wearing armor, the armor suffers a -1 AC penalty for every 8 damage done.
Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 5 (1d12 + 1) piercing damage. When the rust monster does damage with its bite attack, its targets maximum hp is reduced equal to the amount of damage done, reduction to maximum hp is halved if the creature is wearing armor. A creatures maximum hp cannot be reduced to under 5 by the rust monsters bite attack.
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