To take an avariel cleric substitution level, a character must be an avariel (winged elf) about to take her 3rd, 7th, and/or 12th level of cleric.
Avariel cleric substitution levels have the class skills of the standard cleric class.
Skill points at Each Level: 2 + Int modifier.
Level 3: BAB +2, FS +3, RS +1, WS +3, Air Mastery +2, Natural Born Flier
Level 7: BAB +5, FS +5, RS +2, WS +5, Air Mastery +3, Creature of the Air
Level 12: BAB +9/+4, FS +8, RS, +4, WS +8, Air Mastery +4, Creature of the Air, Weather Weaving
Air Mastery: The avariel cleric is a master of air and electricity based effects. Whenever she casts a spell using air or electricity effects, add the listed bonus to the Difficulty Class of all saves against her spells and spell-like effects. This bonus is also added to the avariel cleric’s caster level checks for the purposes of penetrating spell resistance. Additionally, the avariel cleric gains the listed bonus on all saving throws against air and electricity effects.
Natural Born Flier: An avariel cleric that takes the third level racial substitution level becomes more of a swift flier than other avariels. The characters flight speed increases by ten feet. If the character takes the seventh level avariel cleric racial substitution level her flight speed increases by ten and by ten again if she takes the twelfth level avariel cleric racial substitution level.
Creature of the Air: An avariel cleric that takes the seventh level racial substitution level becomes more adept at flying than other avariels. Her maneuverability increases by one class, from Average to Good. The twelfth level avariel cleric racial substitution level increases her maneuverability again, from Good to Perfect.
Weather Weaving: An avariel cleric that takes the twelfth level racial substitution level gains the spell-like ability to control the weather around him. This effect is similar to the control weather spell, but weather command is effective in a five mile radius. The avariel cleric may not direct specific applications of the weather, such as the point of a lightning strike or the path of a tornado. However, the avariel cleric may cause any sort of normal weather to manifest within the area of effect.
As long as the avariel cleric remains within the area of effect, the weather patterns she created will continue. Should the avariel cleric leave an area where she has used weather command, natural weather will reassert itself after 4d12 hours. The avariel cleric may choose not to use weather command and allow natural weather to run its course.
The cost for gaining any of level in the Avariel Cleric substitution class is the loss of spells for that level, i.e. Spellcaster level -1.