Dragon, Ethereal Adult (CR 10)

Large Dragon (Extraplanar)
Alignment: Always neutral
Initiative: +0; Senses: blindsense 60 ft., darkvision120 ft., low-light vision, and keen senses
Languages: Draconic

AC: 29 (-1 size, +20 natural), touch 9, flat-footed 29
Hit Dice: 20d12+100 (230 hp)
Fort +15, Ref +11, Will +14
Speed: 60 ft., fly 40 ft. (clumsy)
Space: 10 ft./10 ft.
Base Attack +19; Grapple +27
Attack: 1 bite +22, 2 claws +17, 2 wings +17, 1 tail slap +17
Damage: 1 bite 2d6+4, 2 claws 1d8+2, 2 wings 1d6, 1 tail slap 1d8
Special Attacks/Actions: Breath weapon 12d6 (23)
Abilities: Str 19, Dex 10, Con 19, Int 14, Wis 17, Cha 14
Special Qualities: Immune to ether cyclones, Frightful Presence DC 21, SR 21
Feats: #Feats: 7
Skills: Skill points: 46
Advancement: 20-21 HD (Huge)
Climate/Terrain: Any land and underground (Ethereal Plane)
Organization: Solitary (1 dragon, any age), clutch (1d4+1 wyrmlings, very young, young, juvenile, or young adults), family (pair of mature adults and 1d4+1 offspring)
Treasure/Possessions: Triple Standard

Source: Draconomicon

Breath Weapon (Su): An ethereal dragon has one type of breath weapon: a cone of force. Like all force effects, this breath weapon affects ethereal creatures when the ethereal dragon is on the Material Plane.

Ethereal Vision (Ex): While on the Material Plane, a very young or older ethereal dragon can see ethereal creatures as if they were visible. While on the Ethereal Plane, an ethereal dragon can see normally out to the range of its darkvision (normally, creatures on the Ethereal Plane have a visual limit of 60 feet). Note that blindsense functions normally even on the Ethereal Plane, regardless of visual limits.

See Ethereal (Su): A very young or older ethereal dragon can see ethereal creatures as if they were visible.

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.