Monsters

Breath Weapon (Su): Either a cone of fire 50x50x50 feet long or a cone of weakening gas 50x50x50 feet long. It cannot use either breath weapon until 1d4 rounds later. Fire damage 10d10, Reflex half DC 25; gas damage Fortitude save (DC 25) or take 5 points of temporary Strength damage.

Frightful Presence (Ex): The dragon can unsettle foes with its mere presence whenever it attacks, charges, or flies overhead. Creatures with fewer than 20 Hit Dice (except for other dragons) within 150 feet of the dragon must succeed at a Will save (DC 24) to avoid this fear effect, and remain 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.

Spells: Knows and casts arcane spells as a sorcerer of level 5, gaining bonus spells for a high Charisma score. Can also cast cleric spells and those from the Law, Luck, and Good domains domains as arcane spells.

Spell-Like Abilities: 3/day-polymorph self and bless. A gold dragon's polymorph self works just like the spell, except that each use allows only one change, which lasts until the dragon assumes another form or reverts to its own (which does not count as a use of this ability). These abilities are as the spells cast by a 5 level sorcerer (save DC 14 + spell level).

Immunities (Ex): All dragons are immune to sleep and paralysis effects. All gold dragons are also immune to fire.

Fire Subtype (Ex): Fire immunity, double damage from cold except on a successful save.

Water Breathing (Ex): The dragon can breathe underwater indefinitely and can freely use its breath weapon, spells, and other abilities while submerged (the cone of fire becomes a cone of superheated steam underwater).

Blindsight (Ex): Can ascertain creatures by nonvisual means (mostly hearing and scent, but also by noticing vibration and other environmental clues) with a range of 150 feet.

Keen Senses (Ex): Sees four times as well a human in low-light conditions and twice as well in normal light. It also has darkvision with a range of 500 feet.