Dragon, Sapphire Very Old (CR 15)

Huge Dragon (Earth)
Alignment: Always lawful neutral
Initiative: +4 (Dex); Senses: blindsense 60 ft., darkvision120 ft., low-light vision, and keen senses
Languages: Draconic

AC: 32 (-2 size, +20 natural, +4 Dex), touch 12, flat-footed 28
Hit Dice: 23d12+115 (241 hp); DR: 10/magic
Fort +18, Ref +17, Will +17
Speed: 40 ft., fly 150 ft. (poor), burrow 15 ft., swim 10 ft.
Space: 15 ft./10 ft. (15 ft. with bite)
Base Attack +23; Grapple +39
Attack: 1 Bite +29, 2 claws +24, 2 wings +24, 1 Tail Slap +24 melee; Breath +29 ranged
Damage: 1 bite 2d8+8, 2 claws 2d6+4, 2 wings 1d8+4, 1 tail slap 2d6+12, 1 crush 2d8+12, Breath weapon 14d4 (26)
Special Attacks/Actions: Breath Weapon 14d4 (26); fear (DC 25), SR 23
Abilities: Str 27, Dex 18, Con 21, Int 18, Wis 19, Cha 18
Special Qualities: Electricity immunity, spider climb, sense psychoportation, skate, stone shape
Feats: #Feats: 8
Skills: Skill points: 98
Advancement: 24-25 HD (Huge)
Climate/Terrain: Inner Planes, underground
Organization: Solitary, pair, or family (1-2 and 2-5 offspring)
Treasure/Possessions: Double Standard

Source: Monster Manual II

Breath Weapon (Su): A sapphire dragon breathes a cone of nearly inaudible sonic energy. In addition to making a Reflex saving throw (DC 30) against sonic damage (18d4), each creature within the cone must succeed at a Will save (same DC) or become panicked for 1d4 rounds. 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.

Frightful Presence (Ex): A very old dragon can unsettle foes with its mere presence. The ability takes effect automatically whenever the dragon attacks, charges, or flies overhead. Creatures within a radius of 270 feet are subject to the effect if they have fewer HD than the dragon (29 HD).

A potentially affected creature that succeeds at a Will save (DC 29) remains immune to that dragon's frightful presence for one day. On a failure, creatures with 4 or fewer HD become panicked for 4d6 rounds and those with 5 or more HD become shaken for 4d6 rounds.

Dragons ignore the frightful presence of other dragons.

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.