Favored Stormpriest - FS (6), SL (10), WP (10), BG (4)

Description
Favored Soul 6/Stormlord 10/Warpriest 10/Blackguard 4

This is a divine build based on front-line party support. It also has a strong evil leader Roleplaying base with Favored Soul roots and combat-oriented divine prestige classes - most notably based on being a Stormlord of Talos.

Pros:
 * Level 9 Favored Soul spellcasting
 * FS spellcasting lends itself to good party support, as the DC is (in theory) poor but spontaneous casting allows for healing and buffing on the fly without needing specific memorization beforehand
 * Charisma based spellcasting is desirable for its synergy with divine shield, epic divine might, and Blackguard boosted saves. No attribute-boosting equipment is necessary to cast upper-level spells
 * 25 BAB - though it misses the 6th attack it's decent for a Stormlord build. You're not quite as dependent on Divine Power as some other divine builds, though it's still a pretty essential buff
 * Persistent auras from both Blackguard and Warpriest add constant buffs and debuffs in a short radius, adding to the front-line party support role
 * Warpriest gives access to extra spells including haste, which is not available to Favored Souls as they don't get to pick domains as Clerics do
 * Achieves the divine feats Divine Shield and Epic Divine Might. Also has access to persistent spell, though this cannot be used with the bonus Haste spell
 * Full Stormlord enhancements including Shocking Burst weapon with a spear and electricity immunity
 * Pretty good saves, able to be boosted further with self-buffs and charisma-boosting equipment
 * Good damage bonuses in Stormlord buffs, Divine buffs, and EDM
 * Fairly good campaign playability. Full Stormlord and Blackguard benefits before level 20. ECL -1 with Aasimar isn't great but is okay with no other XP penalties.  However only 8th level spells are achieved by 20 and conversation skills may be limited depending how you spend your stretched skill points.  Good evil leader RP flavor.

Cons:
 * Poor skill access, compounded by painful cross-class skill requirements for prestige class access
 * No RDD boosted stats means unexceptional strength and that attribute points cannot be grouped overmuch for EDM access
 * Vulnerable to dispelling, even from the common Greater Dispel if you don't take Practiced spellcaster
 * Weak PvP build - Warrior-types can disarm you, Magic-types can dispel your buffs (and though your saves are decent you don't have evasion or other skills to back them up), and stealth types can run circles around you. You have few answers to even basic PvP tricks.  If you're looking for a good overall PvP Stormlord build I refer you to the Pointy Stick
 * Dependency on short/mid-duration buffs for maximum effectiveness means you may lag a bit at the beginning of fights
 * Decent, but ultimately unexceptional AC and AB

Background: Natural Leader

Saving throws (breakdown):
 * F:(-1)+5+7+4+7+4+5=31
 * R:(-1)+(-1)+5+3+1+3+5=15
 * W:(-1)+5+7+1+7+5=24
 * Represented without any bonuses from equipment or spellcraft

Skills
Total points = (4x4)+(5x4)+(4x4)+(10x4)+(10x4) = 132 total

For class requirements, you need:


 * Hide: 5 (by level 10, cross-class)
 * Spot: 5 (by level 20, cross-class)
 * Diplomacy: 8
 * Total: 28, leaving 104 free skill points to distribute


 * Concentration is highly recommended for your front-line support role. Max it.
 * Spellcraft is a good choice as it boosts saves. Must be taken on Warpriest and Favored Soul levels.
 * UMD is always good, though it is cross-class
 * Further points in Diplomacy are useful in campaigns
 * Tumble can give you 1 AC at 10 ranks


 * I got:
 * Concentration: 33
 * Diplomacy: 12
 * Spot: 5
 * Hide: 5
 * Spellcraft: 15
 * Tumble: 10
 * UMD: 16

Build Progression

 * At level 5 you get to choose an energy resistance. Aasimar already are resistant to Sonic, Electricity, and Acid, so pick another energy type (fire works well).
 * Feats before 20 can't really be changed. However the feats Persistent Spell, Monkey Grip, Extend Spell, and the epic spell Vampiric Feast are all optional and can be switched for a feat of your choice. Extend spell is highly recommended. Monkey grip is also recommended as your Warpriest levels allow you access to tower shields, and it would be a good idea regardless.
 * Practiced Spellcaster: Favored Soul is one good choice if you wish to give up Persistent Spell or Vampiric Feast. This will help negate Greater Dispel entirely and help with some buffs.