Highest AC

[DarkJester]

Permanent Reduce Person: +1 ac. (would be +1 more with dex bonus if max dex would allow).
+5 defending armor spikes = +5
+5 defending longsword = +5

You can also try to pay somone to polymorph any object you into something with enormous natural armor in stead of trying to go with reduce person and small size.

 

[Nail]

Ack! I forgot about the classic ploy: the defending armor spikes! How could I?

 

[DarkJester]

I just dislike Tower Shields. Personal distaste, nothing more.

If you had mithril Full Plate, and a 16 Dex on your little halfling fighter, you could get AC 69 without the fighting defensively, etc.

Alter Self into a Trog (and have some Gloves of Dexterity +6) and your AC goes to AC 73.

Etc.

How do you figure AC 73 with the above?

 

[Nail]

Mithril Full Plate +8 AC
Armor Enhancement bonus +5 AC
Mithril Tower Shield +4 AC
Shield Enhancment bonus +5 AC
Dex 15 (Trog + Gloves of Dex +6) +2 AC
Natural Armor (Trog) + 6
Natural Armor Enhancement bonus +5 AC
Deflection bonus +5 AC
Luck bonus +5 AC
Sacred bonus +5 AC
Profane bonus +5 AC
Insight bonus +5 AC
Morale bonus +5 AC
Defending Armor Spikes +5 AC
Defending Longsword +5 AC
Dodge feat +1 AC

AC 86

Add in Fighting Defensively and Combat Expertise at your leisure.

 

[foxwick]

A 20th level Marshal can use their major aura Motive Care to add a +4 circumstance bonus to AC.

 

[Nail]

BTW: As you can imagine, this sort of topic is an old one. (What's the Highest AC you can get?)

Here's a few of the recent threads:

A snarky one: http://www.enworld.org/showthread.php?t=183070

A beginner: http://www.enworld.org/showthread.php?t=182511

a 20th level model: http://www.enworld.org/showthread.php?t=161032

...and for giggles, a "monk's belt" thread (another classic argument that deals with high ACs): http://www.enworld.org/showthread.php?t=122062

 

[kolikeos]

Hmm... Another interesting thing popped into my mind. Lets say there are lots of bad dudes with bows shooting me and I'm not close enough to attack any of them, can I attack, say, my invisible wizard friend, or even the nearby tree, to gain the bonuses of fighting defensively and combat experties against those archers?

 

[foxwick]

Add Dodge at leisure too.

Other bonus types that you don't have above are Alchemical, Competence, and Morale - I bet there's something for the latter two somewhere.

Oh, and I don't think you can both Sacred and Profane - it's one or the other.

 

[Nail]

A 20th level Marshal can use their major aura Motive Care to add a +4 circumstance bonus to AC.

He said core, so no Marshal.

 

[Nail]

Add Dodge at leisure too.

Oh bother. I forgot write down Dodge. I was thinking it! (Not that it matters...) [EDITTED!]

Other bonus types that you don't have above are Alchemical, Competence, and Morale - I bet there's something for the latter two somewhere.

The OP said core (so no alchemical), and I don't think Competance works for AC. Morale is good, though.

Oh, and I don't think you can both Sacred and Profane - it's one or the other.

Although I completely agree that I would not allow both Sacred and Profane to stack IMC, that's not what the core rules say. (shrug)