| Species | Animorph |
| Subspecies | Rust Monster |
| Size | Medium |
| Type | Aberration [Cancer] |
| Hit Dice | 5d8+20 (100 hp) |
| Speed | 40 ft |
| Abilities | Str 15, Dex 24, Con 19, Int 2, Wis 15, Cha 11 |
| Special Qualities | Cold Resistance 5, Darkvision 60', Scent |
| Environment | Underground |
| Organization | Unique |
| Treasure | None |
| Alignment | N |
| Advancement | 6-8 HD (Medium 9-15 HD (Large) |
| Level Adjustment | - |
| Skills |
|---|
| Perception +10 |
| Feats |
|---|
| Weapon Finesse, Track |
| Combat | |
|---|---|
| Initiative | +7 |
| Armor Class (AC) | 6 (50) [+3 base, +7 dex], Flat-footed. 6 |
| Base Attack | +15%/+25% [+2] |
| Full Attack | Antennae +100% (Tentacle chart, see ‘Rust’ below) – Bite +25% [+2] (max Small) |
| Space/Reach | 5 ft./5 ft. |
| Special Attacks | Rust, Water Domain Spells |
| Saves | Fort +5, Ref +8, Will +6 |
| Description |
|---|
| Rust (Ex): When Chunkus hits with an antennae attack against a metal object, the metal begins to corrode; falling to pieces and becoming useless immediately. The attack can destroy up to a 10 foot cube of metal instantly. Magic armor and weapons, and other magic items made of metal, must succeed on a DC 20 Reflex save or be dissolved. The save DC is Constitution-based and includes a +4 racial bonus. A metal weapon that deals damage to a rust monster corrodes immediately. |