After defeating the boss, you will find a chest...

Inside you'll find a +1 Collector Booster of Excitement, packed with extraordinary magical items from the Forgotten Realms. Each booster contains 10 traditional foil cards, 5 rare/mythic cards and 2 extended edge cards. You will also find 19 pieces of silver, two candles and a bag of crow's feet.

What are collector boosters?
Collector Boosters are the ultimate way to expand your collection with unique and exclusive cards. Tons of foil cards, cards with special edges and much more await you in each booster.