Rust Monster

Rust Monster

Medium monstrosity · CR 1/2 · 100 XP

14 AC · 33 HP

Roll the Rust Monster

Bite

Press a roll button. The dice land here.

Stat block

Type
Medium monstrosity, unaligned
Armor Class
14
Hit Points
33 (6d8 + 6)
Speed
40 ft.
Challenge
1/2 (100 XP), proficiency +2
Senses
darkvision 60 ft., passive perception 11
Languages
None
STRDEXCONINTWISCHA
13
12
13
2
13
6

Rust Monster odds against your Armor Class

Chance to hit, then average damage per attack once misses and critical hits are counted.

AttackAC 12AC 14AC 15AC 16AC 18AC 20
Bite (+3)60%
3.5 dmg		50%
3 dmg		45%
2.7 dmg		40%
2.4 dmg		30%
1.9 dmg		20%
1.3 dmg

Rust Monster hit points

The stat block uses the average, 33. Rolled, 6d8 + 6 lands anywhere from 12 to 54.

12: 0.00%13: 0.00%14: 0.01%15: 0.02%16: 0.05%17: 0.10%18: 0.18%19: 0.30%20: 0.49%21: 0.75%22: 1.10%23: 1.54%24: 2.07%25: 2.69%26: 3.38%27: 4.10%28: 4.82%29: 5.50%30: 6.08%31: 6.54%32: 6.83%33: 6.92%34: 6.83%35: 6.54%36: 6.08%37: 5.50%38: 4.82%39: 4.10%40: 3.38%41: 2.69%42: 2.07%43: 1.54%44: 1.10%45: 0.75%46: 0.49%47: 0.30%48: 0.18%49: 0.10%50: 0.05%51: 0.02%52: 0.01%53: 0.00%54: 0.00%
12chance of each total for 6d8 + 654
Hit pointsChance
23 or more97%
33 or more53%
44 or more3%
50 or more<1%

Traits

Iron Scent. The rust monster can pinpoint the location of ferrous metal within 30 feet of itself.

Actions

Multiattack. The rust monster makes one Bite attack and uses Antennae twice.

Bite. Melee Attack Roll: +3, reach 5 ft. Hit: 5 () Piercing damage.

Antennae. The rust monster targets one nonmagical metal object—armor or a weapon—worn or carried by a creature within 5 feet of itself. Dexterity Saving Throw: DC 11, the creature with the object. Failure: The object takes a −1 penalty to the AC it offers (armor) or to its attack rolls (weapon). Armor is destroyed if the penalty reduces its AC to 10, and a weapon is destroyed if its penalty reaches −5. The penalty can be removed by casting the Mending spell on the armor or weapon.

Destroy Metal. The rust monster touches a nonmagical metal object within 5 feet of itself that isn’t being worn or carried. The touch destroys a 1-foot Cube of the object.

Reactions

Reflexive Antennae. Trigger: An attack roll hits the rust monster. Response: The rust monster uses Antennae.

Other CR 1/2 monsters

Ape Black Bear Cockatrice Crocodile Darkmantle Dust Mephit Giant Goat Giant Seahorse Giant Wasp Gnoll Warrior Gray Ooze Hobgoblin Warrior

This page includes material from the System Reference Document 5.2.1 (“SRD 5.2.1”) by Wizards of the Coast LLC, available at dndbeyond.com/srd. The SRD 5.2.1 is licensed under the Creative Commons Attribution 4.0 International License. The averages, odds and tables are ours.