This marginal demon from the famous Très Riches Heures demonstrates the Limbourg brothers’ integration of demonic imagery with the calendar cycle. Positioned in the October folio, the creature embodies seasonal anxieties about harvest destruction. The rendering exhibits the brothers’ characteristic precision: each scale, each membranous wing-fold receives individual attention while maintaining subordination to the larger compositional scheme. The demon hovers at the picture’s edge, marginal yet menacing. Meteorological accuracy enhances the supernatural threat. The cloud formations follow observable storm patterns, grounding fantasy in empirical observation. This naturalistic approach to the supernatural would influence Flemish painting for generations.