Dragon, Deep Wyrmling (CR 4)

Tiny Dragon (Earth)
Alignment: Always Chaotic evil
Initiative: +0; Senses: blindsense 60 ft., darkvision120 ft., low-light vision, and keen senses
Languages: Draconic

AC: 17 (+2 size, +5 natural), touch 12, flat-footed 17
Hit Dice: 6d12+6 (45 hp)
Fort +6, Ref +5, Will +6
Speed: 40 ft., fly 100 ft. (average) , burrow 20 ft., swim 30 ft.
Space: 2 1/2 ft./0 ft. (5 ft. with bite)
Base Attack +5; Grapple +3
Attack: 1 Bite +8, 2 claws +3 melee; Breath +8 ranged
Damage: 1 bite 1d4+0, 2 claws 1d3+0, Breath weapon 2d8 (14)
Special Attacks/Actions: Breath Weapon
Abilities: Str 11, Dex 10, Con 13, Int 14, Wis 13, Cha 12
Special Qualities: True seeing, detect magic, charm immunity, cold and fire resistance 10
Feats: #Feats: 3
Class Skills: Hide, Move Silently, Skill points: 18, and Swim
Advancement: 7-8 HD (Tiny)
Climate/Terrain: Underground
Organization: Solitary or clutch (2-5)
Treasure/Possessions: Double Standard

Source: Monster Compendium: Monsters of Faerûn

Breath Weapon (Su): A deep dragon's breath weapon is a cone of flesh-corrosive gas 2d8 damage, Reflex save for half (DC14). 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).

Earth Subtype

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.