For 2 action points, protect your cards till your next turn from being stolen.
For 2 action points deactivate all of the thiefs abilities till (Heroes and party leaders) your next turn
If you lose to a challenge the other player must discard a card
When you attack monsters, if you do not defeat the monster everyone faces the punishment with you.
Once per turn, you may use 2 action points to put any hero in the game in the discard pile.
If you attack a monster with a Thief, you add + 2 to your roll.