Today I tamed a male Blood Crystal wyvern (pre-tame level 85) with good colors (dark gray scales, red fins, gray crystals, red belly, and wings in that slightly orangeish red that's not the brightest but definitely not that "light red" that's actually just pink), named him Bloodwind, leveled him up a bit by killing three alpha raptors, then transferred him to Valguero. And then I killed old Bloodwind, because that was the whole point - sure, he was my first wyvern, but since his role is "flying far, looking cool, killing stuff" and he was only good for the second part...
Then I decided to fly around on new Bloodwind, saw a level 20 rock elemental and decided to attack it, since I can always get away if it proves to be too dangerous.
And then I spent a long while sitting on a rock, attacking the elemental, only rarely getting hit with boulders.
And then I got some oil, obsidian, metal and crystal. With more effort than a normal resource run would bring me, and in much smaller amounts. Because I only had a stone pick on me.
Next time I'm bringing a metal one. And maybe an argy, because my wyverns suck at hauling weights, and I'm not spending more than one-two points to fix that.
Next time happened right away. New victim was a level 50 elem, the instrument used for harvest - ascendant hatchet, about 180%. Much better results, Bloodwind was only barely able to fly with the mats I got (over a hundred crystal, 40 obsidian, an okay amount of metal, I don't really remember, but his weight is a bit over 300 and he was almost full after I put everything I harvested in him)
Also, Wildfire's crystals and fins returned to their normal color. Great! He looks good again, and I no longer need to doubt my memory in which I definitely tamed an orange-dark brown-orange wyvern and not a yellow-dark brown-orange one.