I'm sorry, but the description you provided does not match any known bird species. There is no bird called "fleshpecker" or one found on a "twilight planet" with satanic aesthetic or specific chemical capabilities. Additionally, the term "biologically spintronic" is not a recognized concept in relation to avian biology. Birds in the taxonomical order Passeriformes, or passerines, are often small to medium-sized songbirds. They exhibit a wide range of physical characteristics, beak shapes, plumage patterns, and colors, with thousands of diverse species found all over the world. If you have any specific, factual questions about birds or any other topic, I'm here to help!