This seems like one of the generically best boons to choose from this scenario. 1 cost for 3 attack, plus a little bit of progress too.
Though I wonder where the flavor texts on the new boons in this scenario come from. It just says "The Lord of the Rings," but a Google search for this card's flavor text has turned up nothing. Also, the art (while not bad) is really plain and I wish it were a picture of her fighting an orc or being rescued from a prison cell in Mount Gram rather than just her standing there looking smug.
(EDIT: As one of the replies has pointed out, the flavor text is a description of Éowyn from The Return of the King.)