Gloomweaver's Grimoire

This heavy tome is bound in a leather so dark it seems to absorb the surrounding light. Dozens of prehensile, ink-black shadowy tendrils sprout from the spine and edges of the cover, constantly undulating and twitching. When the book is closed, the tendrils wrap tightly around it like organic locks. When opened, they spread out, gently supporting the weight of the book and turning pages at the user's silent command.