Spell Hammer Build Critique

[Wings of Peace]

This is mostly a build that came to my mind as a thought experiment though I might run the players in a session I run against a weakened version of it as a boss once they level up a bit. Comments? Critiques? Possible Improvements? Ideally it will be level 20 instead of epic 21. I realize as a dm I can make it have whatever I want but I like to draft the builds like this. It just feels cleaner to me.

Spell Hammer

Race: Human

Flaws: Shaky -2 ranged attack rolls, Vulnerable (-1 ac)

Build:

(1)Sword Sage 1: Blind-Fight, Dodge, Mobility, Iron Will
(2)Sword Sage 2:
(3)Sword Sage 3: Shape Soulmeld: Blinkdog Vest
(4)Sword Sage 4:
(5)Sword Sage 5:
(6)Wizard 1: Precocious Apprentice
(7)Jade Phoenix Mage 1:
(8)Jade Phoenix Mage 2:
(9)Jade Phoenix Mage 3: Adaptive Style
(10)Jade Phoenix Mage 4:
(11)Sword Sage 6:
(12)Jade Phoenix Mage 5: Spring Attack
(13)Jade Phoenix Mage 6:
(14)Sword Sage 7:
(15)Telflammar Shadowlord 1: Arcane Disciple (War Domain: Divine Power)
(16)Telflammar Shadowlord 2:
(17)Telflammar Shadowlord 3:
(18)Telflammar Shadowlord 4: Extend Spell
(19)Incantatrix 1: Persistent Spell
(20)Incantatrix 2:
(21)Incantatrix 3


Flaws: Shaky -2 ranged attack rolls, Vulnerable (-1 ac)

Notable Gear:

-Halo consisting of 11 Ioun Stones

-Minotaur Greathammer

((Not concerned with the armor and defenses at the moment. Will be taking care of that later though if you have a good suggestion it is still welcome.))

Maintained Effects:

-Greater Mighty Wallop

Persistent Effects:

-Divine Power

-Wraith Strike

Post-Buff Attack Sequence:

A: Shadow Blink, Shadow Jaunt, Shadow Stride

B: Full Round Recovery, Shadow Blink

C: Shadow Jaunt, Shadow Stride

B: Full Round Recovery, Shadow Blink

C: Shadow Jaunt, Shadow Stride

Repeat

Damage Per Hit(All Attacks are Touch Attacks): 8d6

Notes:

-Assassin's Stance is being used to meet the sneak attack qualifications for Telflammar Shadowlord.

-Each use of Shadow Blink, Shadow Jaunt, and Shadow Stride allow a full attack.

-Persistent Effects are being Generated via Incantatrix's level 3 ability.