In the turn summary it says:
Movement of all heroes, including collecting Treasures and Artifacts, dropping them, using items, and handing them to others.
But then the dropping part is never picked up again. How exactly does it work? Can I drop artifacts on my space during my turn? How about items?
interesting question, considering also this rule:
9.g Death of a hero
Remember that any artifact that is not found on an A can be assumed to have been dropped by a dead hero.