A topic I love is folklore, myths and legends surrounding animals – each one presented as both blessed and evil; lucky and unlucky.
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Ravens for example:
Andalusian: unlucky if perched on your house. Three croaks results in death.
Highlands of Scotland: a white feather on a Raven, spotted croaking on your right, certain luck.
Norse: Odin’s messengers - Thought and Memory: see and know all.
Germany: the souls of the dammed, or the devil himself
Sweden: Souls of the murdered
Victorian England: if the ravens abandon the Tower of London, it’ll mean the downfall of Britain.
Tibet: acted on behalf of a supreme being.
Elements of these tales influenced the models. For example, the orbs the Light Raven has flying from its back are the memories being collected for the Dark Raven to sit upon, hoarding them like memories.