Dragon, Steel Great Wyrm (CR 18)

Huge Dragon (Air)
Alignment: Usually lawful neutral, often lawful good
Initiative: +0; Senses: blindsense 60 ft., darkvision120 ft., low-light vision, and keen senses
Languages: Draconic, Common

AC: 44 (-4 size, +36 natural), touch 8, flat-footed 44
Hit Dice: 37d12+296 (536 hp); DR: 20/magic
Fort +28, Ref +20, Will +28
Speed: 60 ft., fly 250 ft. (poor), swim 30 ft.
Space: 20 ft./10 ft.
Base Attack +37; Grapple +56
Attack: 1 bite +46, 2 claws +41, 2 wings +41, 1 tail slap +41, 1 crush +41, 1 tail sweep +41
Damage: 1 bite 2d8+11, 2 claws 2d6+5, 2 wings 1d8, 1 tail slap 2d6, 1 crush 2d8, 1 tail sweep -
Special Attacks/Actions: Breath weapon 12d6 (35)
Abilities: Str 33, Dex 10, Con 27, Int 26, Wis 27, Cha 24
Special Qualities: Polymorph, poison resistance, Minor arcane shield, Moderate arcane shield, Enthrall, Charm person, Suggestion, Mass suggestion, Mass charm, CL 21st, SR 38, Fear aura (DC 33)
Feats: #Feats: 13
Class Skills: Bluff, Craft, Disguise, Profession, and Skill points: 302
Advancement: 38+ HD (Huge)
Climate/Terrain: Any city (rarely any hill, plain, or forest)
Organization: Solitary (with humanoid companions)
Treasure/Possessions: Triple Standard

Source: Dragons of Faerûn

Breath Weapon (Su): A steel dragon has two kinds of breath weapons: a line of acid and a cone of poisonous gas. Every creature within the area of the poisonous gas must succeed on a Fortitude save or take 1 point of Constitution damage per age category of the dragon. It must then succeed on a second save at the same DC 1 minute later or take the same amount of damage.

Minor Arcane Shield (Su): A steel dragon's spell resistance against 1st- and 2nd-level arcane spells is higher than normal by +10.

Moderate Arcane Shield (Su): A steel dragon's spell resistance against 3rd- and 4th-level arcane spells is higher than normal by +10.

Poison Resistance (Ex): A steel dragon gets a +10 racial bonus on all Fortitude saving throws against poison.

Spell-Like Abilities: 5/day -- polymorph; 1/day -- charm person, enthrall, mass charm, mass suggestion, suggestion.

Skills: Bluff, Craft (any), and Profession (any) are considered class skills for steel dragons.

Air Subtype

This subtype usually is used for elementals and outsiders with a connection to the Elemental Plane Air. Air creatures always have fly speeds and usually have perfect maneuverability (see the section on Movement).