The Vengeance of Mordor cycle in The Lord of the Rings: The Card Game started with the deluxe expansion A Shadow in the East. Now the cycle continues with the cycle’s first adventure pack, Wrath and Ruin.
The Vengeance of Mordor story began in A Shadow in the East with your heroes (1) traveling the River Running, (2) investigating a series of abductions in Dorwinion, and (3) entering an ancient temple to save the kidnapped from a cult of Sauron. Now back in Dorwinion, Wrath and Ruin continues the story with the city under attack. An army of Easterlings led by Thane Ulchor has invaded Dorwinion, and mechanically it is up to you to control contested locations to support the city guard and repel the invaders!
To aid you in your plight, you might be able to call upon the mercurial Tom Bombadil for assistance. However, he does not start in your deck. He begins the scenario out of play, and you must play a specific event card to shuffle him into the encounter deck for a chance of gaining his help (more details here).
Wrath and Ruin comes to Dorwinion in the third quarter of 2019.