Rust MonsterCR 1/2 · Medium Monstrosity · Stat Block & Encounter Builder

Medium monstrosity, Challenge 1/2. AC 14, 27 hit points.

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Armour Class

Hit Points

Speed

40 ft.

Challenge

1/2 · 100 XP

Alignment

Unaligned

The card

Stat Block

Medium Monstrosity · Unaligned

Rust Monster

1/2

5d8 + 5 · 40 ft. · AC from natural armor

Darkvision 60 ft., passive Perception 11

Languages: —

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

Traits

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

Rust MetalAny 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

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

AntennaeThe 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.

How to actually run it

Tactics

The stat block tells you what it can do. This tells you what to do with it.

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Encounter Difficulty

Encounter Builder

How bad is this fight?

Real DMG maths — XP thresholds by level, and the group multiplier that makes crowds so much worse than the raw total suggests.

Rust Monsters4Party size4Party level3

A real fight. Someone will use a resource they wanted to keep.

Difficulty

Medium

800 adj. XP · ×2

deadly at 1,600

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Counsel

Rust Monster, Answered

What is Rust Monster's challenge rating in D&D 5e?

Rust Monster is Challenge 1/2, worth 100 XP. Encounter maths multiplies XP by the number of monsters, so a group is deadlier than the raw total — use the calculator on this page.

What are Rust Monster's stats?

AC 14 (natural armor), 27 hit points (5d8 + 5), speed 40 ft.. Ability scores: STR 13, DEX 12, CON 13, INT 2, WIS 13, CHA 6.

Where does Rust Monster fit in an encounter?

As a monstrosity of Challenge 1/2, it suits a party whose level is in the same range. Adjust party size and level in the builder above to see the difficulty shift live.

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