Aspect of Tiamat (CR 10)

Large Dragon (Extraplanar)
Alignment: Always chaotic evil
Initiative: +4 (Improved Initiative); Senses: blindsense 60 ft., darkvision 120 ft., low-light vision, Listen +16, and Spot +16
Languages: Common, Draconic, and Infernal

AC: 23 (-1 size, +14 natural), touch 9, flat-footed 23
Hit Dice: 10d12+50 (115 hp); DR: 5/epic
Fort +12, Ref +7, Will +10
Speed: 30 ft., fly 50 ft. (clumsy)
Space: 10 ft./10 ft.
Base Attack +10; Grapple +21
Attack: Bite +16 melee
Full Attack: 5 bites +16 melee
Damage: Bite 2d6+3
Special Attacks/Actions: Breath weapon
Abilities: Str 24, Dex 11, Con 21, Int 19, Wis 16, Cha 18
Special Qualities: immunity to magic sleep effects and paralysis
Feats: Cleave; Great Cleave; Improved Initiative; Power Attack
Skills: +18 on other planes), +20 following tracks on other planes, Intimidate +17, Knowledge (arcana) +17, Knowledge (history) +17, Knowledge (religion) +17, Knowledge +17 (the planes), Listen +16, Search +17, Sense Motive +16, Spot +16, and Survival +16 (+18 following tracks
Advancement: -
Climate/Terrain: Nine Hells of Baator
Organization: Solitary
Treasure/Possessions: None

Source: Miniatures Handbook

Breath Weapon (Su): 40-ft. cone, once per day, 8d6 acid, cold, electricity or fire, Reflex DC 20 half. The save is Constitution-based.

Extraplanar Subtype

A subtype applied to any creature when it is on a plane other than its native plane. A creature that travels the planes can gain or lose this subtype as it goes from plane to plane. This book assumes that encounters with creatures take place on the Material Plane, and every creature whose native plane is not the Material Plane has the extraplanar subtype (but would not have when on its home plane). An extraplanar creatures usually has a home plane mentioned in its description. These home planes are taken from the Great Wheel cosmology of the D&D game (see Chapter 5 of the Dungeon Master's Guide). If your campaign uses a different cosmology, you will need to assign different home planes to extraplanar creatures.

Creatures not labeled as extraplanar are natives of the Material Plane, and they gain the extraplanar subtype if they leave the Material Plane. No creature has the extraplanar subtype when it is on a transitive plane; the transitive planes in the D&D cosmology are the Astral Plane, the Ethereal Plane, and the Plane of Shadow.