Just sharing my latest build
This is the fight against the 3 Plagued Smilodons. Did it on second try, cos I missed some buffs on first try, and dearly paid for that.
This is Unfair at level 7, you can decide by yourself if this build is viable or not.
My actual build is Vital Strike Flat-Footed melee, but you can choose a different approach since you only need 5 mandatory levels for the best tank ingame, the other 15/35 are free for whatever dps/healing build you want
The build is as follows:
Race: Half-Elf - kindred (22 Charisma)
Background: Whatever. I go for pickpocket cos of +2 Initiative
Stats: 22 Charisma…rest depends on your build choice. I went 14 INT and 16 STR cos I plan to go Vivisectionist (int) Vital Strike Melee (str).
Alignment: Any Lawful
Lvl 1 : Monk - Scaled Fist (Important first pick. If you pick monk later the bonuc AC gets a -1 bug)
Lvl 2 : Oracle - Almost Whatever. Nature’s Whispers for Charisma to AC
Lvl 3 : Witch - Stigmatized. Powerless prophecy (mandatory to avoid alphastike on your tank flat-footed)
Lvl 4-5: Paladin - Almost Whatever. Need Smite Evil and Divine Grace.
So by level 5 you have Insanely high Saves, you’re untouchable and you have 15/35 levels to play whatever class you want
Just a little math on the AC, based ONLY on spells and items you will eventually find in the game
Charisma bonus: 20 (Base +12 Bonus +8 Cha head)
Witch: +5 (hex, familiar, ring)
Deflection: +5 (Ring/Spell)
Natural Enchanc: +5 (Ring/Spell)
Armor: +8 (bracers)
Shield: +4 (spell from scroll even)
Enhanchment Armor: +5 (spell)
Enhanchment Shield: +5 (spell)
Fight Defensively: +4
Monk Armor: +2 (dodge)
This will give you a net 75 AC with a lvl 5 char with lvl 20 spells.
You can add more items (belt, boots, better monk armor, neck, gloves).
You can add the Mythic buff: Archmage Armor
You can add +10 AC (+5) Deflection on a boss by using Smite Evil
You can add more feats like Crane Wing or Combat Expertise
You can add +10 AC with Smite Chaos from hellknight
You can add up to +14 AC by going Alchemist
and so on…
I honestly think that if you want to make the best possible front-line MC tank you should get these 5 levels, and fill the remaining 15 with whatever you like