From the publisher's website:
Fire Emblem Warriors offers a twist on the acclaimed Fire Emblem series by uniting fan-favorite characters from Fire Emblem history to participate in over-the-top battles focused on real-time, tactical action rather than turn-based strategy.
Fire Emblem Warriors offers action-filled combat through an epic campaign starring more than 20 playable warriors, including two new characters, Lianna and Rowan, battling alongside beloved heroes like Marth, Lyn, Xander, Corrin and Chrom.
From the box back:
The strongest bonds are forged in battle! Save the world from the evil Chaos Dragon in this fusion of Fire Emblem and Warriors-style gameplay. Command Marth, Chrom, Corrin, and other legendary heroes in a fully-voiced journey of swordplay and strategy! Obliterate hordes of enemies in action-packed fights while dominating the battlefield with tactical commands to your troops. Pair up your favorite Fire Emblem heroes and take advantage of the classic weapon triangle to lay waste to your foes.