If Spike ate Carbonate rock, that would be the carbon, hydrogen and oxygen needed for meat, and any sulphates would do for the protien cross linking, nitrates for other materiaqls or would he have to firebreath the air to make nitrous compounds to blend with water so he can drink it to absorb it?

Good thing Twilight never got into that branch of biochemical research?

Carácter this story can you do sandbar and yona or thorax and ember?

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Unfortunately I won't be taking any more suggestions for awhile. I am trying to finish this series at this point. I have one more already planned then I hope to move on. If I ever return, I will be sure to post of a blog for suggestions.