Dungeons and Dragons and Ponies - oh, Celestia.

In her old masterwork book, the most well-loved bard in Equestrian history compiled every poem, song, and story in her repertoire, including the only reliable and detailed account written of the lives of a notorious team of six adventurers. Found to have left her hooves sometime in the last few years of her life, that one copy has since been thought of along the lines of the ambitious bard's Philosopher's Stone, and so now that it has finally been recovered, the two holding it have no worries about the value the Book of Lyra itself will cash in for - what remains to be seen is what extra surprises there are to be had out of the information in it first.