Black dragon

"'This dragon's head looks decidedly like a skull thanks to its deep-socketed eyes and wide, flat nasal opening. It has forward-curving horns and a spinal crest that peaks just behind the head and tapers off about three quarters of the way down the neck. An acidic smell surrounds the dragon, whose scales are mostly dull ebony and dark gray.'"

Black dragons are sometimes known as skull dragons because of their skeletal faces. Adding to the skeletal impression is the gradual deterioration of the hide around the base of the horn and the cheekbones. This deterioration increases with age and does not harm the dragon. On hatching, a black dragon’s scales are thin, small, and glossy. As the dragon ages, they become larger, thicker, and duller, helping it camouflage itself in swamps and marshes. A black dragon typically lairs in a large cave or underground chamber next to a swamp or murky pond. Their lairs always have two entrances: one underwater through the adjacent swamp/pond, and one above-ground, disguised amidst the undergrowth. They are especially fond of coins. Older dragons sometimes capture and question humanoids about stockpiles of gold, silver, and platinum coins before killing them.

Traits

 * d12 Hit Dice
 * Always chaotic evil
 * Damage reduction 15/+1
 * Immunity to acid, paralysis, sneak attacks, and mind-affecting spells
 * Spell Resistance 24
 * Weapon Proficiency (creature), Cleave, Power Attack, Great Cleave, Improved Initiative, Iron Will, Lightning Reflexes, Darkvision, and Low-Light Vision feats
 * Acid breath attack
 * True seeing