+2 Bracers of Armor are pretty worthless when you can cast a basic Mage Armor spell that provides 4 AC. The lower level bracers are more useful for special properties (like
Spell Storing) than as a source of raw AC when you can just cast Mage Armor anyway. Also your character will have something like 7 or 8 dex instead of the 16+ you want to have solid AC as a mage. Wand of magic missiles competes with cantrips in usefulness, frankly, and is probably more useful as vendor loot than if you were to actually use it. In essence the Ring of Protection +1 and 4 potions of cure light wounds are the neat things you have to look forward to. Investing into AC gets very expensive for dubious returns, so it's typically better to abandon AC, invest in high constitution (get that +6 belt asap) and stack temporary hitpoints (Death Knell spell) on top while using methods to avoid getting hit at all, like blur, displacement, mirror image, invisibility, or plain old stealth. There's the
Wisdom in the Flesh religion trait that can be used to turn Stealth into a wisdom-based class skill, but it requires you to worship Irori, which is probably not a very good deity for a Cleric, but it opens up stealth as an option. There's also the
Disciplined Body and
Balanced Education to make various rolls into wis instead, but they only work once a day (you can get both or even all three though). Disciplined Body does let you use wis for a reflex roll once per day though, so that's a +6 (or more) to reflex save when you need it most.
The Trickery domain lets you make a single mirror image as a move action, which will be less useful once you start using Lesser Spell Synthesis to consume full-round actions for dualcasting, but it should help you survive the lower levels. If you are dedicated to developing AC as a Mystic Theurge with terrible dex, you will want to avoid Ecclesitheurge because you'll want to wear a buckler made of
mithral or singing steel. A light steel buckler made of singing steel would give you no armor penalty or arcane spell failure chance, giving you +1 to AC at all times. +2 AC if you make it a +1 singing steel buckler. The downside is that with 8 dex, singing steel buckler, mage armor spell, and ring of protection +1, you will still only have 15 AC (you can get more AC with the Barkskin spell though - obtained through domain or mystic past life). You can also use the Shield spell for +4 shield bonus to AC (does not stack with shields), which is better than an actual shield until you get a +4 shield at least, but unlike Mage Armor the Shield spell is something you have to cast in combat. Part of the trouble with Mystic Theurge builds is how few stats you have left over to do other things. Ecclesitheurge does have the benefit of letting you change your second domain when needed, including into the
Conversion inquisition (Clerics can take Inquisitions as domains; it is simply typically a poor choice because it gives you no spells, only inquisition powers.) and then acting as the party face. But there are other ways to be a party face as a wis-based class. You can turn diplomacy into a wis-based skill with
Empathic Diplomat or bluff with
Cunning Liar (if you want both, you will need to use an
exemplar trait and the
Additional Traits feat), and you can also get ranks in Profession (Barrister) and Profession (Courtier) to talk your way out of difficult spaces. That's for Wis-based; the
Clever Wordplay social trait can make any cha-based skill int-based instead and
Student of Philosophy social trait will make both diplomacy and bluff int-based for social uses (but not for gathering information or feinting in combat). I'm mentioning all of this because your party lacks a good talker, it seems. If you take Student of Philosophy trait (and maybe some of those professions) you can be the party face pretty easily even without the Conversion inquisition.
The other stunt to raise AC is if you get the
Protector archetype on your familiar (extra exploit for Bloodline Development for Arcane for familiar as 1st-level Wizard), the familiar can boost your AC too, but if you want 5 levels of wizard to share damage with it, you have to get the familiar through a feat (Eldritch Heritage is probably not in the cards given the charisma prerequisite, so that would mean Iron Will > Familiar Bond > Improved Familiar Bond). You can also pump your familiar's Aid Another check with
Benevolent armor (animal barding) and
Ring of Tactical Precision (Benevolent armor is cheaper at first; also, use hand of glory necklace or have it replace a starting feat with
Extra Item Slot if no ring slot exists). The amount of feats invested here is a bit unpleasant unless you're going strictly for a Familiar as 1st-level Wizard.
So what are the changes and directions you are currently leaning towards, with regards to race, stats, trait, feats, armor, archetype?
