The Dark Seal is a small, ornate tome with a dark purple cover, bound in what appears to be enchanted leather with glowing violet runes etched into its surface. The edges of the pages are slightly tattered, suggesting age and frequent use, while the center of the cover features a prominent, intricately designed seal that pulses with a faint magical aura. The book is compact, easily held in one hand, with a weight that feels substantial yet not cumbersome, indicating its mystical properties.