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*Sources*
The Crimson Diablos is mentioned - and shown - exactly once, in a sketch for Hunter's Encyclopedia I, which is reused for Illustrations I, which you can buy in english. Basically nothing is canonically known about it, except that it is big, red and much stronger than a normal Diablos.
Sketch Art by my sister, Artsyrean:
https://twitter.com/Artsyrean
Paint Art by me.
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