Descent: Betrayers War. Tarnished Brooch trinket question...

We have an option to bring a trinket called tarnished brooch. We have brought it with us 3 times, and defeated the enemy that accompanied it, and nothing happened. We are wondering if we have missed something, or if perhaps this item requires four or five or more times in order to allow the card to be flipped over.

Trinkets are very precious and make a huge difference in the game, so we don't feel like continuing to bring it with us just in the off chance that eventually it will turn into something better. We were expecting to flip the card over and use the other side right away, but that has never been an option.