When you put Bitterness into play in a Realm slot, if there is a Fortress in the Realm (belonging to either team), give Bitterness a +1 Intensity token. Don’t give up the fight!
This is a Mild Emotion. If this Emotion is Empowered, it is replaced with a Strong Emotion called LETHARGY.
Empower is a Spirit Action available in the Full Game rules.