Arcade

Arcade Mode
Arcade is a new solo or co-op mode where players fight battles and earn rewards that carry over to all multiplayer modes. Offering infinite replayability, this quick play mode will deliver a new battle every time with varying objectives, enemies, and modifiers.

Arcade was introduced in Season 8.

Access
To have access to Arcade mode you need to own the Marching Fire DLC.

Gear Score
Playing Arcade mode will require your Hero to have a certain amount of Gear Score, depending on the score and the quest you are playing you will receive a buff or a debuff.