willowy form grew brighter, its glow mantling the men in golden hues.
In heraldry "mantling," also known as "panache," "lambrequin" or "contoise," is an ornamental appendage to an escutcheon, of flowing drapery, forming a background (see Heraldry).
As it withdrew, its willowy form grew brighter, its glow mantling the men in golden hues.