Add adventure warning for amulet of plot significance in castle basement

[surfmadpig]

If you have an amulet of plot significance, add warning to equip it (like with Mohawk wig in top floor) when attempting to adventure in the giant castle basement

[houeland]

Since you can leave, equip the item, and re-enter the basement noncombats, warning there doesn't seem necessary. Maybe some text on the choice page to explain it.