You should write something about the turn undead stacking rules.
I don't know if I wrote this or someone on the old boards (666? 333? Whatever, something like that) did.
They also stack, they don't add (a level 4 paladin turns as a L1 cleric. A level 4 cleric turns as a L4 cleric. A level 4 paladin/level 4 cleric turns as a level 5 cleric)
As for turning, I don't think so.
Example 1: Class Text for Classes that Grant their own turning pool, and don't stack.
Turn or Rebuke Undead (Su): Any cleric, regardless of alignment, has the power to affect undead creatures by channeling the power of his faith through his holy (or unholy) symbol (see Turn or Rebuke Undead).
A good cleric (or a neutral cleric who worships a good deity) can turn or destroy undead creatures. An evil cleric (or a neutral cleric who worships an evil deity) instead rebukes or commands such creatures. A neutral cleric of a neutral deity must choose whether his turning ability functions as that of a good cleric or an evil cleric. Once this choice is made, it cannot be reversed. This decision also determines whether the cleric can cast spontaneous cure or inflict spells (see above).
A cleric may attempt to turn undead a number of times per day equal to 3 + his Charisma modifier. A cleric with 5 or more ranks in Knowledge (religion) gets a +2 bonus on turning checks against undead.
Turn Undead (Su):When a paladin reaches 4th level, she gains the supernatural ability to turn undead. She may use this ability a number of times per day equal to 3 + her Charisma modifier. She turns undead as a cleric of three levels lower would.
Command Undead (Su): When a blackguard reaches 3rd level, he gains the supernatural ability to command and rebuke undead. He commands undead as would a cleric of two levels lower.
Rebuke Undead: Like an evil cleric, an ur-priest of second level or higher can rebuke undead. He uses his ur-priest level as the cleric level for determining the success and damage...(see turning in PHB pg 159)
Example Pool 2: Classes that Require and Progress Turning:
Levels of War Priest stack with any of the characters cleric or paladin levels when turning or rebuking undead.
A rsoP adds his radiant servant levels to his cleric levels for all purposes related to turning undead.
Example Pool 3: Classes that progress turning, but also grant it if a character doesn't already have it.
Sacred exorcists can turn undead as clerics do. If a sacred exorcist has this ability from another class, her class levels stack to determine her effective turning level.
An apostle of peace can turn undead as a good cleric of his apostle of peace level would. If he is also a cleric (or paladin), he also adds his apostle of peace levels to his effective cleric levels to determine his turning capacity.
Example Pool 4: Classes that progress turning, but do not grant it.
Only Deadgrim from Magic of Eberron that I could find, and I don’t have that book.
That being said, there are clear text differences in all those example pools.
