You may only Solid one of these every single limited rest but that doesn’t detract from how good this feature is. Don’t underestimate the usefulness of Augury, especially when playing with indecisive people. To my understanding, the sole official source may be the single image in Volo’s (Unless of course https://dragonbornmonk12234.blogofoto.com/59346119/details-fiction-and-mephistopheles-tiefling-5e