Ethereal Dragon

(From 3.5e Draconomicon: The Book of Dragons - 2003):

Ethereal dragons spend most of their lives floating through the Ethereal Plane, spying into the Material Plane for valuable treasure. 

Ethereal dragons’ natural coloration is a pearlescent brown-gray, which accounts for their nickname of “moonstone dragon.” They have needlelike claws and teeth. 

Ethereal dragons are naturally curious and inquisitive, and often spy on those “stuck” on the Material Plane. They are also greedy, and may come to covet the valuables carried by those they spy upon. In such cases, an ethereal dragon might visit the Material Plane only to appropriate such items, returning to its native Ethereal Plane as soon as possible. 

Ethereal dragons speak Draconic. 

Combat: Most ethereal dragons prefer escape over battle, heading either to the Ethereal Plane or the Material Plane to avoid conflict. If forced into a fight, or if the ethereal dragon feels combat is necessary, it uses its powers to frustrate its foes. An adult or older ethereal dragon relies on dimensional anchor to trap opponents on one plane while it escapes to the other.

Young and older ethereal dragons’ natural weapons are treated as magic weapons for the purpose of overcoming damage reduction. 

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. 

Strike Ethereal Creatures (Ex): An ancient or older ethereal dragon can strike ethereal creatures as if they were material. This ability does not allow an ethereal dragon on the Ethereal Plane to affect creatures on the Material Plane. 

Summon Ethereal Cyclone (Su): Once per day, a great wyrm ethereal dragon on the Ethereal Plane can summon an ethereal cyclone. This requires a full-round action, and the storm lasts for 1 minute. All creatures (except undead) within 120 feet of the ethereal dragon are affected as described in Chapter 5 of Manual of the Planes. (If you don’t have access to Manual of the Planes, you can simply rule that each creature within the cyclone is thrown 1d10 miles in a random direction.) This power has no effect anywhere other than on the Ethereal Plane.