Breath Weapon (Su): Either a cone of cold 30x30x30 feet long
or a cone of paralyzing gas 30x30x30 feet long. It cannot use
either breath weapon until 1d4 rounds later. Cold damage 4d8,
Reflex half DC 17; gas damage Fortitude save (DC 17)
or be paralyzed for 1d6+2 rounds.
Spell-Like Abilities: 3/day-polymorph self. A silver
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 12 + spell level).
Immunities (Ex): All dragons are immune to sleep and paralysis
effects. All silver dragons are also immune to cold and acid.
Cloudwalking (Su): The dragon can tread on clouds or fog as
though on solid ground. The ability functions continuously but
can be negated or resumed at will.
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.