Dragon, Brown Old (CR 18)

Gargantuan Dragon (Earth)
Alignment: Usually neutral evil
Initiative: +0; Senses: blindsense 60 ft., darkvision120 ft., low-light vision, keen senses, and tremorsense 500 ft.
Languages: Draconic

AC: 30 (-4 size, +24 natural), touch 6, flat-footed 30
Hit Dice: 27d12+189 (364 hp); DR: 10/magic
Fort +22, Ref +15, Will +19
Speed: 60 ft., burrow 60 ft.
Space: 20 ft./15 ft. (20 ft. with bite)
Base Attack +27; Grapple +51
Attack: 1 Bite +35, 2 claws +30, 2 wings +30, 1 Tail Slap +30, 1 crush +30 melee; Breath +35 ranged
Damage: 1 bite 4d6+12, 2 claws 2d8+6, 2 wings 2d6+6, 1 tail slap 2d8+18, 1 crush 4d6+18, 1 tail sweep 2d6+18, Breath weapon 16d6 (30)
Special Attacks/Actions: Breath Weapon, fear (DC 27), SR 27
Abilities: Str 35, Dex 10, Con 25, Int 18, Wis 19, Cha 18
Special Qualities: Acid immunity, create water, sandstorm, summon huge Air elemental as 9th-level caster
Feats: #Feats: 10
Class Skills: Climb, Hide, Skill points: 114, and Survival
Advancement: 28-29 HD (Huge)
Climate/Terrain: Any desert
Organization: Solitary, pair, or family (1-2 and 2-5 offspring)
Treasure/Possessions: Double Standard

Source: Monster Compendium: Monsters of Faerûn

Breath Weapon (Su): The brown dragon's breath weapon is a line of acid. It does not use this attack against mounted foes, since it knows that horses are good eating. 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.

Tremorsense (Ex): Brown dragons can automatically sense the location of anything within 500 feet that is in contact with the ground.

Create Water (Sp): The dragon can use this spell-like ability once per day.

Sandstorm (Sp): Once per day, an adult brown dragon can create a vortex of violently churning sand at a distance up to 80 yards away. All creatures within a 60-foot radius of the center of the sandstorm take 1d6 points of damage each round they remain within the sandstorm. Characters in the swirling sands are blinded and must make a Balance check (DC 15) during each round they move more than 5 feet or fall prone.

Summon Huge Air Elemental (Sp): Once per day, an old brown dragon can cast summon nature's ally VI to summon one Huge air elemental, 1d3 Large air elementals, or 1d4+1 air elementals of smaller size.

Summon Greater Air Elemental (Sp): Once per day, an ancient brown dragon can cast summon nature's ally VIII to summon one greater air elemental, 1d3 Huge air elementals, or 1d4+1 air elementals of smaller size.

Frightful Presence (Ex): A young adult or older 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 240 feet are subject to the effect if they have fewer HD than the dragon (27).

A potentially affected creature that succeeds at a Will save (DC 27) 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.