Cracking Open...Thunderstone Quest: Rotten Roots

About Thunderstone Quest: Rotten Roots, from BoardGameGeek:

A new Quest for Thunderstone Quest, This Deck Builder, will take your party to an adventure on a new level! A new guardian, Filleath has always felt he was destined for more, but it seems he's always lived in the shadow of greater creatures, none greater than Ashbrow, the great tree guardian of the Deepwood. But a new pact with a being from the Abyssal lands will bring an end to all that. Now armed with dark powers, he will spread a blight that puts the entire forest in jeopardy.