Wizard Acrobat Staff
Human
Str 15, Dex 18, Con 14, Int 14, Wis 8 Cha 8
L1 Rog 1 - Two Handed Fighting, Dodge (Human)
L2 Wiz 1 - Extend Spell (Wizard)
L3 Wiz 2 - Mobility
L4 Wiz 3 - Dex +1
L5 Wiz 4
L6 Rog 2 - Toughness
L7 Wiz 5 - Quicken (Wizard)
L8 Wiz 6 - Dex +1
L9 Wiz 7 - Spring Attack
10 Wiz 8
11 Wiz 9
12 Wiz 10 - Dex +1, Improved Two Handed Fighting, SF: Evocation (Wizard)
13 Wiz 11
14 Wiz 12
15 Rog 3 - Improved Crit: Bludgeon
16 Wiz 13 - Dex +1
17 Wiz 14
18 Wiz 15 - Whirlwind Attack, Spell Penetration (Wizard)
19 Rog 4
20 Rog 5 - Dex +1
Thief Acrobat - 43
Staff Control, Thief Acrobatics 3, Sly Flourish 3, Acrobat Staff Training
Stick Fighting, Quick Strike 3, Acrobat Staff Training
Improved Second Strikes 3, Shadow Dodge 3, Sweeping Strikes 3, Dexterity, Acrobat Staff Training
Staff Lunge 3, Dexterity, Force's Point, Acrobat Staff Training
Staff Specialization, Vault, Acrobat Staff Training
Eldritch Knight -23
Eldritch Strike, Improved Mage Armor 3, Arcane Siphon 3, Toughness 1
Spellsword, Improved Shield 3
Imbue the Blade, Arcane Barrier, Critical Mastery 3, Dexterity
Subtle Force I, Knight's Transformation
Pale Master - 14
Dark Reaping, Negative Energy Conduit 3, Spell Critical: Negative Energy I
Pale Shroud: Shroud of the Wraith, Spell Critical: Negative Energy II, Cloak of Night
Undead Augmentation I: Ghost Wind, Negative Energy Adept 3
The build needs at least +2 Str tome.
The Wizard feats SF:Evocation and Spell Penetration might be Mental Toughness and Imp Mental Toughness if it seems quixotic to take the former with just 15 levels of Wizard in a Dex build.
The idea overall is to leverage the good EK stuff with the great Thief Acrobat stuff and fight in favorable area of effect spells to add damage. We're taking just enough PM to keep a constant pulsing heal going and to get 20% incorporeality from Wraith.
We'll use Draconic Incarnation and Shadowdancer to improve the AoE's and to give us 3 independent Abundant Step abilities to get around (Spring Attack, Vault and Spread Your Wings all have separate cooldowns and so they can be chained 1-2-3)