Dragon, Deep Young (CR 8)
AC: 21 (+11 natural), touch 10, flat-footed 21
Hit Dice: 12d12+24 (102 hp)
Fort +10, Ref +8, Will +10
Speed: 40 ft., fly 150 ft. (poor) , burrow 20 ft., swim 30 ft.
Space: 5 ft./5 ft.
Base Attack +17; Grapple +19
Attack: 1 Bite +14, 2 claws +9, 2 wings +9 melee; Breath +14 ranged
Damage: 1 bite 1d8+2, 2 claws 1d6+1, 2 wings 1d4+1, Breath weapon 6d8 (18)
Special Attacks/Actions: Breath Weapon
Abilities: Str 15, Dex 10, Con 15, Int 16, Wis 15, Cha 14
Special Qualities: True seeing, detect magic, charm immunity, cold and fire resistance 10, Snake form 3/day, humanoid form 3/day
Feats: #Feats: 5
Class Skills: Hide, Move Silently, Skill points: 42, and Swim
Advancement: 13-14 HD (Medium-size)
Organization: Solitary or clutch (2-5)
Treasure/Possessions: Double Standard
Breath Weapon (Su): A deep dragon's breath weapon is a cone of flesh-corrosive gas 6d8 damage, Reflex save for half (DC 18). 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.
True Seeing (Su): Deep dragons have a permanent form of true seeing (as the spell).
Snake Form (Su): A young deep dragon can assume its serpentine (legless) form three times per day. This form is the same size as the dragon, but able to move through smaller tunnels because it has no legs. The dragon's AC worsens by -6 in this form. It moves at 30 feet, flies at 10 feet (poor), and swims at 30 feet. It loses all claw attacks in this form, but can constrict opponents, dealing 2d6 damage.
If the dragon hits with this attack, it can make a free grapple check (without provoking an attack of opportunity). If it wins this check, it grabs and constricts its victim, automatically dealing the above damage every round until the opponent dies or breaks free.
Humanoid Form (Su): A young deep dragon can polymorph self into a humanoid form three times per day at young age. It can alter the size, shape, hue, and features of its bipedal form to resemble a human, elf (surface or drow), half-elf, half-orc, orc, hobgoblin, dwarf, duergar, or any similar creature of Medium-size. If the dragon wears armor to improve its AC in this form, the armor is destroyed when the dragon changes shape.
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.