ring of gyges, n.All

The Ring of Gyges (n.) makes ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠a shepherd invisible, and he uses it to seduce the queen, kill the king, and become king of Lydia.

The Ring of Gyges (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠a rack for the questioner: ask what they would do if they could conceal it, and they either confess themselves atrociously guilty or grant that whatever is wrong in itself ought to be shunned.