Ok so I have this idea for a build. A nearly unkillable PM which can also tank in emergencies. I believe that the PM has a lot of potential for tanking for several reasons.
Basically your looking at four layers of protection:
-Layer 1: Blur or displace, stacks with wraith incorp for 75% miss chance
-Layer 2: Self cast solid fog or cloudkill
-Layer 3: AC (yeah yeah save your objections, this is my main question but more on this later)
-Layer 4: 10 dr/- stoneskin, 15% reduction from shield mastery (not sure which one is applied first), epic docent of night boon of undeath (same as stackable dr/8)
Tanks can have these as well (minus the 25% stackable incorp chance unless dark monk) the difference is that PM's are self sufficient and don't need to rely on others to cast these essential buffs. Also if you add the undead immunities (+ wf immunities if applicable), the PM is virtually immune to everything except maybe earthgrab, drowning (which is strange seeing as you are "dead"), and flesh to stone if not wf. Also add in the death aura which heals you every 2 sec for 30-70 hit points and a PM has the potential to be Unkillable.
Spellcasting already generates a lot of hate, so potentially you do not have to get high scores of intimidate. Also the Ring of Lies from gianthold has a hidden effect that generates 15% more hate from spellcasting which might help if you need to tank. *Important note: Not looking for a raid or epic tank, leave that to the professionals, main point is that you could tank when no other option is available and to be very survivable.
Now the AC question mentioned above: How much AC can you realistically get as a WF PM if you take mithral body and use a mithral large shield. I'm looking for anywhere between a 10% - 25% miss chance. Don't need anything crazy, just an extra layer of protection.
Any critisism is welcome. An answer to the AC question is highly sought for =D