Breath Weapon (Su): Either a cone of cold 40x40x40 feet long
or a cone of paralyzing gas 40x40x40 feet long. It cannot use
either breath weapon until 1d4 rounds later. Cold damage 10d8,
Reflex half DC 23; gas damage Fortitude save (DC 23)
or be paralyzed for 1d6+5 rounds.
Frightful Presence (Ex): The dragon can unsettle foes with its
mere presence whenever it attacks, charges, or flies overhead.
Creatures with fewer than 19 Hit Dice (except for other
dragons) within 150 feet of the dragon must succeed at a
Will save (DC 23) 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 Air, Good, Law, and Sun
domains as arcane spells.
Spell-Like Abilities: 3/day-polymorph self; 2/day-feather fall.
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 5 level sorcerer (save DC 14 + 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 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.