To Do List :
Find the bloody TBoS! It's not on 339 anymore as of a week ago
Double check all questionable mechanics
Snag ironclad IoM and means of targetting tapestry
Load on the power!
Ok, the middle two so far seem ok. I assume IoM is gained through FS? The main powers of the TBoS were persistify anything and two means of saying fuck you to AMF. So we need Shadow Weave Magic at the very least, and as you said, a one level dip in Shadow Adept would rock. Getting IoM requires a divine base, sadly. Next question : is selection of spells known limited only be the deity in question? Because FS has ACF's that allow it arcane spells as divine, and if you're patron is Mystra, every spell she casts is conceivably potentially divine as well. Going off of this premise, our next goal is clear : match the versatility of my Rainbow Warsnake and SCM builds by snagging a psionic tattoo of psyref so we can reswap any spells we need at the time just by spending the PP. Hell, if it's available pre-epic, that's almost worth throwing a good chunk of WBL for at-will use. Anyone know the formula (well, the base gp value actually, since we have two parts of the equation already) for ML 20 on a 4th level power at will? Or even 3/day would probably be more than enough.
Next, why bother with SGoSm if you're using the ACF? That seems redundant, until I know the reasoning behind it (the +1 CL though shores up the one eaten by War Weaver). I was initially thinking sneaking into War Weaver at level 2, but at least 3 levels are needed for IoM, so going off of that, we get :
[spoiler]Favored Soul 3/War Weaver 5
1st: Heighten Spell and Versatile Spellcaster, 3rd: Enlarge Spell[/spoiler]
If we obviate Spellguard out, that frees a total of 5 levels. Contemplative can go if we take Planar Touchstone (Catalogs of Enlightenment) for the magic domain, freeing up another level (hope it works...several of my builds use it). Sacred Ex needs level 10 before entry at 11th, so we've got two levels to play with before we can start DMMing, though getting one of those last two of DK would put us at FS 3/WW 5/DK 3/Sac Ex 1 at level 12, with DMM capability.
[spoiler]Favored Soul 3/War Weaver 5/Dweomerkeeper 3/Sacred Exorcist 1
1st: Heighten Spell and Versatile Spellcaster, 3rd: Enlarge Spell, 6th: Extend Spell, 9th: Persistent Spell, 12th: DMM (Persist)[/spoiler]
We've now gotta take a flaw to cram an item creation feat in there, since we can't get it off domains (used to snag magic domain) or bonus feats (we're not a wizard). That's ok, we won't notice -1 AC, and really if the DM won't allow flaws we can always wait til 15th and do without something for a level or two. 15th level will see IoM ostensibly, and a second flaw or waiting until 18th would be needed to get shadow adept, but that frees up 3 levels at the end for whatever we want. Incantatrix 3 would do away with the need for DMM entirely (though then we can snag DMM Quicken, and hop into rocket tag), and we can suffer the loss of Evocation with access to illusion. Furthermore, if it only applies to lost
arcane spells of one school, we don't lose squat, since we're purely divine. That would snag one extra metamagic feat of our choice, namely reach or ocular spell, assuming it's needed, and that shores up any doubt on targetting the tapestry as well. So our final build :
[spoiler]Favored Soul 3/War Weaver 5/Dweomerkeeper 1-3/Sacred Exorcist 1/Dweomerkeeper 4/Incantatrix 4/Shadow Adept 1/Dweomerkeeper 5-6
1st: Heighten Spell and Versatile Spellcaster (Flaw Feats: Scribe Scroll, Iron Will that can also be bought), 3rd: Enlarge Spell, 6th: Extend Spell, 9th: Persistent Spell, 12th: DMM (Persist or Quicken), 15th: Shadow Weave Magic, 18th: Initiate of Mystra, MM: Reach/Ocular Spell, MM: Quicken Spell[/spoiler]
Some levels might work better in different positions, and I'm going to double check it after it's up so I can step back and examine it, but that should fulfill most if not all of the objectives in the original post, while still remaining RAW (other than the FS bit), or at least as RAW as the TBoS was.
EDIT : Here's a summary and level by level.
[spoiler]1)Favored Soul 1-ACF, Heighten Spell, Versatile Spellcaster
2)Favored Soul 2-
3)Favored Soul 3-Enlarge Spell
4)War Weaver 1-Eldritch Tapestry
5)War Weaver 2-Quiescent Weave I
6)War Weaver 3-Quiescent Weave II, Extend Spell
7)War Weaver 4-Quiescent Weave III
8)War Weaver 5-Enlarged Tapestry, Quiescent Weave IV
9)Dweomerkeeper 1-Mantle of Spells : (something nice here), Persistent Spell
10)Dweomerkeeper 2-
Arcane Sight11)Dweomerkeeper 3-Mantle of Spells : (something nice here)
12)Sacred Exorcist 1-Exorcism, Turn Undead (3+Cha/day), Shadow Weave Magic
13)Dweomerkeeper 4-Supernatural Spell 1/day
14)Incantatrix 1-Metamagic Feat: Quicken Spell
15)Incantatrix 2-Cooperative Metamagic, DMM Quicken
16)Incantatrix 3-Metamagic Effect
17)Incantatrix 4-Metamagic Feat : Reach/Ocular Spell
18)Shadow Adept 1-(3 Shadow feats), Initiate of Mystra
19)Dweomerkeeper 5-Mantle of Spells : (something nice here)
20)Dweomerkeeper 6-Supernatural Spell 2/day
Bought : Iron Will (Otyugh Hole), Dragonblood Pool, Scribe Scroll (Heward's Hall)[/spoiler]