The Dragonic Civilization mod has enemies that use a special metal called Dragonbane or something. Guess what it does?
I still can't believe the guy called it "dragonic" instead of "draconic."
I think the Creator of "Dragonic Civilization" has already told you why he chose to name it "Dragonic" instead of "Draconic"
I personally think it should be dragonic instead of draconic to differentiate between how this mod is about dragons, not dracons. There is a difference between the two.
I'm surprised this argument is still around, since I remember first seeing it some 15 or 20 years ago when some idiot decided to change what "draconic" meant in order to flesh out a new race of part dragons.
The original use of "draconic" was based on the latin word "draco" which means dragon. The "-ic" suffix there gives the meaning of having the form or character of. Though the true Latin form would be Dracoic, whereas the English bastardization of the Latin added the n in there as a flavor letter. Thus draconic literally means "characterized by or having the form of dragon(s)." That leaves it pretty open for use in anything that deals with dragons, provided that there is context that utilizes the -ic suffix.
Anyway, the word draconic is for context sensitive attribution; it attributes the context as being "of the dragon" which is why the dragon language is called "Draconic." In this case the fact that you've named the language using the word provides the context. Thus "Draconic" when referencing the language is saying "Language of the Dragons."
In the case of actual use, Draconic is the correct form (if one can be said to exist, since it's not a word typified in actual Latin anyway and is not an Engilsh word by strict derivation) by virtue of accepted commonality. So, in this case, Draconic Civilization would basically be saying "Civilization of the Dragons" or "Dragons' Civilization" rather than being a reference to some dubiously named sub-race of dragons.
However, once some of the fantasy splinter groups decided to birth the "dracon" as being their accepted shorted form of dragon half breeds, or psuedo-dragon species, it flared as a point of contention for a while and eventually did establish a small presence in the fantasy realm. Even so, it was never a very commonly used reference, largely because of the number of people who would jump on your case for using the term "incorrectly". Indeed, if you search around the internet for Dracon, you'll find very, very few references; mostly with Dracon used as a name for a specific entity.
But, the big thing that everyone began to realize all those years ago, is that it didn't really matter what word you used. Even less so if you're a bunch of geeks crowded around a table to play what is essentially a structured game of make-believe.
This is akin to the dwarfs vs dwarves and the elfs vs elves usage battles that have been waged for the last 30-40 years.