Giant sky Thunder Whales are floating high up in the sky, they are super-intelligent and for some reason they love to fly close to the thunderstorms in the cloudy skies. On their back, you can find the "thunder stones" - minerals filled with the energy of thunderbolts.
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I made it as a part of the ArtStation Challenge - check it out here: https://www.artstation.com/contests/untamed-when-animals-ruled-the-world/challenges/119/submissions/64702