Rise of the Underworlds released on June 30, 2021.

• Over 40 new collectible cards are being added to the game.
• 3 new champions to play with; We're getting Ekko, Pyke, and Rek'Sai.
• New Keyword: Lurk - When you attack while I'm on top of your deck, I lurk, granting lurker allies everywhere +1|+0. Max once per round.
• New boards, guardians, emotes, and card backs featuring the new champions will be released.