1990's Draconomicon has some guidelines for crossbred dragons that seem useful for 3.5/5e. From what I can tell, though, rules for land/flight/(swim) speeds, magic resistance, and elemental immunity (which I've seen implied to be tied to breath type, but it's easier to find exceptions than a confirmation on this, so maybe it counts as an "innate ability"?) seem to be absent from its guidelines.

What determines what those values should be?


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