TLDR: Make me a BBEG for a L11 party of five.

It turns out that I have a bounty on my head for two tons of gold (200,000gp), and like any PC worthy of the name, my first thought was "How can I turn myself in and collect the bounty?" And it's feasible! All we have to do is defeat the Parallel Universe Me who, um, burned down half the Feywild.

Parallel Universe Me (PUM) went on a quest with his magic instructor, just like I did, but when the master mage said "That's a Gem of Elemental Fire, don't touch it!", PUM grabbed up. (I must not have heard the "Gem of Elemental Fire" part, or I'd have picked it up too. Duh). That was probably around L6, when PUM and I looked something like this:

Spoiler: L6 Pyro
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====== Created Using Wizards of the Coast D&D Character Builder ======
Aedhan, level 6
Pixie, Wizard (Mage)
School: Pyromancy School
School: Illusion School
Expert Mage Option: Illusion School Expert
Eldritch Harlequin (Eldritch Harlequin Benefit)
Theme: Sarifal Feywarden

FINAL ABILITY SCORES
STR 13, CON 18, DEX 16, INT 22, WIS 16, CHA 21
(don't hate me because my stats are beautiful)

AC: 21 Fort: 18 Ref: 20 Will: 21
HP: 48 Surges: 10 Surge Value: 12

TRAINED SKILLS
Arcana +14, Bluff +16, History +14, Nature +15

UNTRAINED SKILLS
Acrobatics +6, Athletics +4, Diplomacy +8, Dungeoneering +6, Endurance +7, Heal +6, Insight +6, Intimidate +8, Perception +6, Religion +9, Stealth +10, Streetwise +8, Thievery +7

POWERS
Basic Attack: Melee Basic Attack
Basic Attack: Ranged Basic Attack
Sarifal Feywarden Utility: Sarifal's Blessing
Pixie Utility: Pixie Dust
Pixie Utility: Shrink
Wizard Utility: Ghost Sound
Wizard Utility: Prestidigitation
Wizard Utility: Light
Wizard Attack 1: Flaming Sphere
Wizard Attack 1: Horrid Whispers
Wizard Attack 1: Burning Hands
Wizard Attack 1: Orbmaster's Incendiary Detonation
Wizard Attack 1: Scorching Burst
Wizard Attack 1: Beguiling Strands
Wizard Attack 1: Magic Missile
Wizard Utility 2: Moonstride
Arcana Utility 2: Studied Casting
Wizard Attack 3: Color Spray
Wizard Attack 3: Fire Shroud
Wizard Attack 5: Visions of Avarice
Wizard Attack 5: Summon Magma Beast
Pixie Utility 6: Pixie Invisibility
Wizard Utility 6: Fire Shield

FEATS
Level 1: Superior Implement Training (Accurate staff)
Level 2: Staff Expertise
Level 4: Enlarge Spell
Level 6: Destructive Wizardry

ITEMS
Spirit Fetch
Accurate staff of Ruin +2 x1
Cape of the Mountebank +1 x1
Make Whole
Tenser's Floating Disk
Pyrotechnics
Enchant Magic Item
Transfer Enchantment
Siberys Shard of the Mage (heroic tier)
Summoned Cloth Armor (Basic Clothing) +2 x1
Viper Belt x1
====== End ======


Since that divergent point, the party has gotten to L10.5, and we've gotten on the trail of PUM. The trail is easy to follow, as it's a continuous line of scorched ground and ash leading through woods (it's easy to identify the tree types--they're all ashes) and villages (known henceforth Cinderville, Ashland, etc) and to a portal to the Elemental Chaos. PUM left some little presents behind for anyone following him--flame zombies and various fire-related demons. Can't really fault a fellow for that -- I occasionally summon magma beasts and hellhounds myself-- but I'm getting visions from his mind and he's Evil and Enraged now. And also he's summoned L15s.

We're about to go through that portal. My current build is

Spoiler: Good Me, well, okay, Chaotic Neutral Me, L11
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====== Created Using Wizards of the Coast D&D Character Builder ======
Aedhan, level 10
Pixie, Wizard (Mage)
School: Pyromancy School
School: Illusion School
Expert Mage Option: Illusion School Expert
Master Mage Option: Pyromancy School Master
Eldritch Harlequin (Eldritch Harlequin Benefit)
Theme: Sarifal Feywarden

FINAL ABILITY SCORES
STR 13, CON 19, DEX 16, INT 23, WIS 16, CHA 21

AC: 24 Fort: 21 Ref: 22 Will: 25
HP: 65 Surges: 10 Surge Value: 16

TRAINED SKILLS
Arcana +16, Bluff +20, History +16, Nature +17

UNTRAINED SKILLS
Acrobatics +8, Athletics +6, Diplomacy +10, Dungeoneering +8, Endurance +9, Heal +8, Insight +8, Intimidate +12, Perception +8, Religion +11, Stealth +12, Streetwise +10, Thievery +9

POWERS
Basic Attack: Melee Basic Attack
Basic Attack: Ranged Basic Attack
Sarifal Feywarden Utility: Sarifal's Blessing
Pixie Utility: Pixie Dust
Pixie Utility: Shrink
Wizard Utility: Ghost Sound
Wizard Utility: Prestidigitation
Wizard Utility: Light
Wizard Attack 1: Flaming Sphere
Wizard Attack 1: Horrid Whispers
Wizard Attack 1: Burning Hands
Wizard Attack 1: Orbmaster's Incendiary Detonation
Wizard Attack 1: Scorching Burst
Wizard Attack 1: Beguiling Strands
Wizard Attack 1: Magic Missile
Wizard Utility 2: Moonstride
Arcana Utility 2: Studied Casting
Wizard Attack 3: Color Spray
Wizard Attack 3: Fire Shroud
Wizard Attack 5: Visions of Avarice
Wizard Attack 5: Summon Magma Beast
Pixie Utility 6: Pixie Invisibility
Wizard Utility 6: Fire Shield
Wizard Attack 7: Phantom Foes
Wizard Attack 7: Corrosive Mist
Wizard Attack 9: Summon Hell Hound
Wizard Attack 9: Wall of Fire
Wizard Utility 10: Phoenix Step
Wizard Utility 10: Blur

FEATS
Level 1: Superior Implement Training (Accurate staff)
Level 2: Staff Expertise
Level 4: Enlarge Spell
Level 6: Destructive Wizardry
Level 8: Dual Implement Spellcaster
Level 10: Superior Will

ITEMS
Spirit Fetch
Accurate staff of Ruin +2 x1
Cape of the Mountebank +1 x1
Make Whole
Tenser's Floating Disk
Pyrotechnics
Enchant Magic Item
Transfer Enchantment
Siberys Shard of the Mage (heroic tier)
Spiderweb Robes Cloth Armor (Basic Clothing) +3 x1
Staff of Fiery Might +2 x1
Staff of Resilience +2
Wand of Shield +2
Ritual Candle
Cincture of the Githzerai x1
Scroll of Fey Passage
Analyze Portal
Linked Portal
Comrades' Succor
Fey Passage
Raise Dead
Comprehend Language
Sending
Delay Affliction
Disenchant Magic Item
Residuum
====== End ======


The rest of our party is a war butterfly (he sometimes mutters that he's a dragonborn pala-barian, but he has wings and he's blue and he's my mount, clearly he's a butterfly), scout, bard, and usually an artificer.

My GM is big on story but is happy to take suggestions on monsters. So, if you were converting a PC pixie pyromancer to a BBEG, what would his statblock look like?