Rage is an ability which an unit gains Boost 3 when health is 2 or less. It will be checked every turn, alike Spearhead and is immune to Sap. To decrease the attack further of an unit, it must be done before the health gets to 2 or lower, or using total Sap 4 or higher otherwise.
List of cards with RageEdit
All the cards with rage are hero cards or troop cards.
List of cards with Rage BurnEdit
There is currently only one card with Rage Burn, that is Raging Flames.