From Compendium of Worldly Lore
The stormsingers have learned secret methods of harnessing the magic powers of music to influence and control the weather. These songs seem to have greater effects and potency in the frostfell than in more temperate or tropical regions, so most stormsingers prefer to dwell in the frostfell so they can practice their special form of magic. Ships that ply the seas of the frostfell often hire on a stormsinger partially to serve as entertainment for long sea voyages, but mostly so the stormsinger can protect the ship from powerful storms.
The music used by stormsingers to control the weather derives from a specific form of bardic music; as a result, all stormsingers have at least a little bit of training as bards. Many of them are actually multiclass bard/druids, although bard/clerics and bard/sorcerers make excellent stormsingers as well. They depend upon their sharp wits and ability to control weather for protection, so it is fairly unusual to encounter a stormsinger with any levels of fighter or similar classes.
Role: Spell Utility
Characteristics: Singers who can control the very weather with their songs
Source: Frostburn
Game Rule Information
The Stormsinger has the following game statistics.
Abilities: Charisma for your weather controlling performances
Alignment: Any Nonlawful
Hit Die: d6
Starting Gold: N/A
Class Skills
The Stormsinger's class skills are Climb (Str), Concentration (Con), Craft (Int), Diplomacy (Cha), Jump (Str), Knowledge (arcana) (Int), Knowledge (geography) (Int), Knowledge (nature) (Int), Listen (Wis), Perform (Cha), Profession (Wis), Search (Int), Spellcraft (Int), Spot (Wis), Swim (Str), and Wilderness Lore (Wis)..
Skill Points at 1st Level: (4 + Int modifier) × 4
Skill Points at Each Additional Level: 4 + Int modifier
Class Features
All of the following are class features of the Stormsinger.
Weapon and Armor Proficiency: A Stormsinger is proficient with whatever they were already proficient with prior to taking levels in this class.
Spells per Day/Spells Known: At each stormsinger level, the character gains new spells per day (and spells known, if applicable) as if she had also gained a level in a spellcasting class she belonged to before adding the prestige class. She does not, however, gain any other benefit a character of that class would have gained (improved chance of controlling or rebuking undead, metamagic or item creation feats, and so on), except for an increased effective level of spellcasting. If a character had more than one spellcasting class before becoming a stormsinger, she must decide to which class she adds the new level for purposes of determining spells per day and spells known.
Bardic Music: A stormsinger's class level stacks with any levels of bard she has for purposes of determining the number of times per day she may use bardic music. Many of the stormsinger's high-level abilities require her to use bardic music as well. When a stormsinger uses her bardic music ability to create a stormsong effect (see below), it counts as one (or more) uses of her bardic music for the day.
Stormsong: The stormsinger can use her bardic music ability to create various storm-related effects in addition to the normal uses of bardic music. Additionally, the stormsinger can detect the approach of a natural storm 24 hours in advance of it reaching the character's current location.
Gust of Wind (Sp): A stormsinger of 1st level or higher with 9 or more ranks in Perform (sing) can use bardic music to generate a "gust of wind", as the spell of the same name. Her caster level is equal to her ranks in Perform (sing), with a maximum caster level of 20th.
Thunderstrike (Su): At 3rd level, a stormsinger with 11 or more ranks in Perform (sing) can use bardic music to unleash a deadly thunderbolt. The bolt can be targeted at any one creature within 60 feet, and the stormsinger must make a successful ranged touch attack to hit the target. If she hits, the stormsinger then makes a Perform (sing) check; the result indicates how much electricity damage the thunderbolt deals. A Reflex save (DC 10 + stormsinger's class level + Cha modifier) halves the damage. If the creature fails its Reflex save, it must make a Fortitude save (same DC) or be deafened for a number of rounds equal to the damage dealt.
Control Winds (Sp): At 5th level, a stormsinger with 13 or more ranks in Perform (sing) can use bardic music to cast "control winds". This functions like the spell of the same name, except that the duration of the effect is concentration plus 3 rounds, and the save DC is 10 + the stormsinger's class level + Charisma modifier. The stormsinger's caster level is equal to her ranks in Perform (sing), with a maximum caster level of 20th.
Winter's Ballad (Su): At 7th level, a stormsinger with 15 or more ranks in Perform (sing) can use bardic music to cast "control weather. This functions like the spell of the same name, except that the duration of the effect is concentration plus 1d6 hours. The stormsinger's caster level is equal to her ranks in Perform (sing), with a maximum caster level of 20th.
Great Thunderstrike (Su): At 9th level, a stormsinger with 17 or more ranks in Perform (sing) can use bardic music to unleash a terrible stroke of lightning, followed by a deafening clap of thunder. The great thunderstrike affects a line 60 feet long from the stormsinger. The stormsinger makes a Perform (sing) check; the result indicates how much electricity damage the great thunderstrike deals. A Reflex save (DC 10 + stormsinger's class level + Cha modifier) halves the damage. If a creature fails its Reflex save, it must make a Fortitude save (same DC) or take an additional 2d6 points of sonic damage and be permanently deafened. The great thunderstrike is very strenuous and uses up two of the stormsinger's bardic music uses for the day.
Storm of Vengeance (Sp): At 10th level, a stormsinger with 18 or more ranks in Perform (sing) can use bardic music to cause a "storm of vengeance", as the spell of the same name (DC 10 + stormsinger's class level + Cha modifier). Her caster level is equal to her ranks in Perform (sing), with a maximum caster level of 25th. This potent ability is quite exhausting to use; each time it is activated, the stormsinger uses four of her bardic music uses for the day.
Stormpower Ex: At 2nd level, a stormsinger gains a +2 bonus on Perform (sing) checks made to use her stormsong powers and adds a +2 bonus to her caster level with stormsong powers when the temperature is cold or colder (40° F or lower) or when she is in a storm.
Resistance to Electricity Ex: At 4th level, a stormsinger gains resistance to electricity 5. This increases to resistance to electricity 10 at 6th level, and resistance to electricity 15 at 8th level.