As I don't wanna make a new thread for nearly the same build, I'll post my bk build using prissy here: See this thread
.18 sorcerer, 22 blackguard
(12 sorc, 12 blackguard, 6 sorc, 10 blackguard)
Put the first four points until level 16 into cha, the rest into strPre-epic:
Power Attack (human bonus feat)
Auto Still Spell I-III (bane knight bonus at level 24)
Gr. Str I-IV Epic bonus (blackguard):
Epic Weapon Focus
Imp. Combat CastingLegendary:
Legendary Weapon Focus
Legendary Spell Penetration (after you've read the sp book)
Gr. Str V-VIIISkills:
Tumble 60 (after LSA)
Hide 5 (cross-class)
Taunt rest (about 55)Spells:
Level 1: Grease, Mage Armor, Shield, Protection from Alignment, Endure Elements (no bk spell, but maybe it'll become one one day)
Level 2: Flame Weapon, Death Armor, Balagarn's Iron Horn, Eagle's Splendor, Endurance
Level 3: Displacement, Vampiric Touch, Keen Edge (only slashing), Greater Magic Weapon (only +10, or 11 with items, but it's nice until you hit LLs)
Level 4: Elemental Shield, Stoneskin, Minor Globe of Invulnerability (bk spell, therefor better than the other globe which isn't), Bestow Curse (to lower sr)
Level 5: Bigby, Mestil's Acid Sheath, Energybuffer, Mindfog (nothing else to take)
Level 6: Bigby, Tenser's Transformation, Greater Spellbreach (dispells mantles and lowers sr)
Level 7: Bigby, Shadow Shield, Spellmantle (very useful for soaking implosion)
Level 8: Bigby, Premonition (you'll notice at which levels you'll hit the required soak for each area and will do far better in there)
Level 9: Bigby
AC: no idea; about the same as every other str. tank in heavy armor I think. You might look into some smiter threads for it. But you'll get 20 natural armor from tenser's, 16 deflection from shield and can max out most of your abilities (str, dex, con, cha) via buffs too, so you're not that gear dependent (along with the prissy immunities) and premo/energy buffer will reduce damage taken quite a bit as well.
Compared to sabregirl's Baseborn Titan build, this one has to put more points into str and will still come out a bit lower because of the Titan's fantastic +5 str. That's why I went with 22 levels which let you chose imp. combat casting as a bonus feat, but you need to cast gr. sanc from scrolls (not that important until well into LLs) and are short of one level 9 spell. No dev crit either, but you'll barely get to 90 ab at level 60 so I took some more great str. instead of dev crit (if you can't hit anything you can't crit it either).
I chose longsword as sabregirl suggested but I wouldn't chose it again. There's one area you really need to chose your weapon by damage types, and all three "good" longswords you'll find until then (level 29, 35, db) won't work there because of their damage so taking another weapon you'll lose about 5-7 ab = -1 attack that hits. And you definitely want to visit this area with your bane knight at least once in his life: it's great. So I suggest taking another weapon: light flail for lots of crits or warhammer(bludgeoning)/battleaxe(self keen) for big crits. Even a cep weapon works so you can switch around while leveling using club feats and decide which one's the best for you in progress.
From what I've read, you won't have a nice time in hells with 7 base dex, so you might either skip taunt I'm not using regularly anyway for two more points into dex. Maybe it's possible to grab everything that could cause harm to you because of low dex but I don't have any experience in hells; not with this char or any other yet. But I guess if you've got a dex lower than 14 it won't matter that much anyway because you'll fail most checks no matter if you've got 7 or 9 dex, so you might as well keep taunt or put the points into craft armor/weapon.
So far (level 54) this build is a solid tank, I might reincarnate at some point to chose another weapon focus and get rid of the voice so I can use taunt a bit more often...or I'll get rid of taunt and chose a better soundset.
I can usually cover whatever is needed for the area with rare immunity rings and even if you can't: Energy buffer will take some pressure off you're immunities. Some problems still exist: Mord and Breach in areas where you need water breathing or levitation. If you know you can't wear that mord ring because you'd miss out on immunities just stay back and cast breach/bigby on every monster casting breach on you. But don't wade into a crowd and get dispelled in the middle...that usually proved fatal.
and before I forget it: A great many thanks to Gegnar and Simmone who helped me with/gave me the needed items for prissy, the gear for the respective area and explained a lot of other important things (not only about this run) to me.