From Dragon Quest Wiki
Storeyteller is a spell in the Dragon Quest series. It checks to see what floor of a dungeon the party is currently on.
Dragon Quest III
Added to the GBC remake, called "Location," it is learned by thieves at level 10.
Dragon Quest V
Sancho joins with this spell known.
Dragon Quest VI
Storeyteller is learned upon advancing to rank 5 of the Thief vocation.
Dragon Quest VII
Storeyteller is learned upon advancing to rank 6 of the Thief vocation.