Bell of Courage

Like the Book of Truth and the Candle of Love, the Bell of Courage is a physical object that somehow embodies the Principle it stands for.

The Bell has been seen in-game. The attacks of the foul Minax broke it somehow, and it had to be repaired using Blackrock.

For more, see BNN: The Principle Pieces - Part I.

The game manufacturers have stated that the Bell of Courage may play a role in the ending of the Warriors of Destiny event cycle. This would fit, because both the Book and Candle have played roles as well.