1.
This is not correct. Incarnum Dragons, Fang Dragons, and Rust Dragons have no such extra immunity beyond those inherent in the Dragon type.
2.
Short version: The only consistent thing about accepted True Dragons is having the Dragon type and 12 age categories. All other metrics have at least one (often implicit; due to a lack of a feature in a statblock or something, rather than a line explicitly stating, "Despite being a True Dragon, this creature lacks feature X") exception, thus setting a precedent that the DWK can follow and still be considered a True Dragon under.
3.
Some fuel for the fire:
Every true dragon is immune to at least one type of elemental energy (acid, cold, electricity, or fire),....
It explicitly calls out what energy types just above that side bar.
Planar Dragons presented in Draco. and their listed immunities that don't fit:
Look, I can name three people who never paid attention to the arguments but love to jump in and claim kobolds are.
Let's see.
A.See also
I can name several varieties of True Dragon that have no more potential to use arcane magic than most any given creature printed-as in, they don't have any innate ability and must turn to class levels.
I believe you scraping from those exception > rules posts.
Why?
1. Lack of any rules quote or idea of what you are talking about. Gem, Planar, Lung. Three words would have made is sound like you did some personal research.
2. X dragon lacks this. THERE FOR ALL TRUE DRAGONS DO NOT NEED IT!. Big sign right there.
3. Saying it is illogical. Take a programming class, or just plain read a book on it w/e.
4. You only refute a third of my point but consider it the perfect rebuttal.
The True Dragon entry states all gain spellcasting and most gain additional spell choices. All inherited types have that unless explicable written otherwise. This is D&D's rules. This is object based logic used in programming. Fact is, that method never had a point. Now what happened to waiting till page 6?
B.BtW, your exception based logic fails even if you follow it's premise and not D&D rules. All listed TDs gain DR, SR, and HD via Aging. There is no exception to those three traits.
In short, I already said it.
The only two arguments against that are JaronK's exception replaces general which is the biggest failure since failing was invented, and ignoring everything but one certain line.
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New find:
1. By context, Actual Dragon = True Dragon
Also by context, Kobolds aren't Actual Dragons.
Therefore, Kobolds aren't true Dragons.
(This is my first DWK argument, so I apologize if this is already well known)
Now it's not well known (more ignored material infact). When I told JaronK about it he called it fluff and ignored it. because fluff doesn't mean anyth...
I strongly disagree. I think it's very clearly intended by the authors of that book that DW Kobolds be True Dragons. They introduced fluff to support it (Kobolds formed from the blood of the first True Dragons, plus the constant references to how much kobolds wanted to be counted as proper dragons).
Oh right. See ignoring everything that disagrees with you.
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Srsly this thread gets a lot of posts. I can't keep up. I eat, shower, work, bed your sister, sleep, and the thread jumps five or six pages. If I directly asked someone something and missed it, point me back to it via PM.