Sometimes you just have to go it alone

Damage: Sometimes you just have to go it alone. You'll melt the usual faces, while handling a variety of mechanics including interrupting heals, chasing down runners,

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timing cooldowns, avoiding harmful mechanics, and more.
 Healer: Four NPCs will join you to form a full party. It will take a special healing touch to keep your friends alive, as you work together to face the challenges of attacking enemies.
Choose Your own Adventure
Proving Grounds will be available in four different modes: Bronze, Silver, Gold, and Endless. Each mode allows you the opportunity to test your mettle and learn a bit more about your role by putting you in the thick of a grouping experience. You’ll have to beat each one (beginning with Bronze) to take on the next mode. Once you’ve beaten Gold, you’ll unlock Endless and be truly prepared to astound and amaze your friends with your prowess.
In Endless,

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you’ll push yourself to the limits and see just how long you can survive as each wave of foes becomes more and more difficult to withstand. The longer you survive Endless, the higher your score, and the system will track your progress so you can see just how well you’ve done.
Choose to Endure

You’ll be able to reenter the Proving Grounds as much as you want as you work to improve your skills earn Achievements, and claim some bragging rights when you survive longer than any of your friends. It’s just a quick chat with the NPC, and you're quickly back in action.