Dragon, Amethyst Very Young (CR 4)
AC: 19 (+8 natural, +1 Dex), touch 11, flat-footed 18
Hit Dice: 9d12+9 (76 hp)
Fort +8, Ref +6, Will +6
Speed: 40 ft., fly 150 ft. (poor), burrow 20 ft., swim 10 ft.
Space: 5 ft./5 ft.
Base Attack +9; Grapple +11
Attack: 1 Bite +11, 2 claws +6, 2 wings +6 melee; Breath +11 ranged
Damage: 1 bite 1d8+2, 2 claws 1d6+1, 2 wings 1d4+1, Breath weapon 4d8 (16)
Special Attacks/Actions: Breath Weapon 4d8 (16)
Abilities: Str 15, Dex 12, Con 13, Int 10, Wis 11, Cha 10
Special Qualities: Force resistant, planar travel, poison immunity
Feats: #Feats: 4
Skills: Skill points: 6
Advancement: 10-11 HD (Medium-size)
Climate/Terrain: Inner Planes, underground
Organization: Solitary or clutch (2-5)
Treasure/Possessions: Double Standard
Monster Manual II
Bite: The dragon can use its bite snatch opponents. Bite attacks use the full attack bonus.
Claw: The dragon can use its claws to snatch opponents. Claw attacks are at -5 to the attack bonus.
Wing: The dragon can slam opponents with its wings, even when flying. Wing attacks are at -5 to the attack bonus.
Breath Weapon (Su): An amethyst dragon has one breath weapon, a line of concussive force (Reflex save for half damage, DC16, 4d8 damage). It can choose to deal subdual damage instead of normal damage. Using a breath weapon is a standard action. Once a dragon breathes, it can't breathe again until 1d4 rounds later. A blast from a breath weapon always starts at the dragon's mouth and extends in a direction of the dragon's choice.
Dragons ignore the frightful presence of other dragons.
Immunities (Ex): All dragons are immune to sleep and paralysis effects. Amethyst dragons are also immune to poison.
Spell Resistance (Ex): As dragons age, they become more resistant to spells and spell-like abilities, as listed in the variety descriptions
Blindsight (Ex): A dragon can ascertain creatures by non-visual means (mostly hearing and scent, but also by noticing vibration and other environmental clues) with a range of 60 feet.
Keen Senses (Ex): A dragon sees four times as well a human in low-light conditions and twice as well in normal light. It also has darkvision with a range of 200 feet.
This subtype usually is used for elementals and outsiders with a connection to the Elemental Plane of Earth. Earth creatures usually have burrow speeds, and most earth creatures can burrow through solid rock.