Monsters

Breath Weapon (Su): Either a cone of fire 40x40x40 feet long or a cone of weakening gas 40x40x40 feet long. It cannot use either breath weapon until 1d4 rounds later. Fire damage 4d10, Reflex half DC 18; gas damage Fortitude save (DC 18) or take 2 points of temporary Strength damage.

Spell-Like Abilities: 3/day-polymorph self. 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 2 level sorcerer (save DC 13 + 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 60 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 200 feet.