It's part of the new 6.66 update for the game.
Click image for larger version

Name:	DEHM.jpg
Views:	6569
Size:	115.8 KB
ID:	3514166

Bethesda and id Software announced the release of the 6.66 update for DOOM Eternal today. This update adds, among other things, a brand new horde mode.

This arcade-style mode will start you off with all perks, all runes, and all upgrades and drop you into the fray with only a Combat Shotgun at the ready. You will have to defeat weaves of demons in order to unlock additional weapons. There are three different maps included with today's release of the Horde Mode.

Successfully completing this mode will unlock seven new skins, including the DOOM II Slayer and Biker Slayer. That Biker skin better include assless chaps, that's all I'm saying.

You can compete against your own best scores or others through online leaderboards that will reset with each new season.

Today's update includes some improvements to the multiplayer "Battlemode" as well as two new Master Levels for the truly epic demon slayers out there.

Horde Mode
Prove your mettle and compete against other players to climb seasonal leaderboards in a new arcade-style Horde Mode.
  • Start off with all perks, runes, and upgrades and arm yourself with only a mastered Combat Shotgun.
  • Defeat waves of demons to unlock additional guns and fight through three challenge-packed levels.
  • Complete all encounters and puzzles to unlock more than 7 new skins, including the DOOM II Slayer and the Biker Slayer.
  • Compete against yourself and rival Slayers for the high score in seasonal leaderboards by playing at higher difficulty levels, completing bonus rounds, killing bounty demons, avoiding power weapons, and more.

Experience a refined BATTLEMODE, the 2v1 competitive multiplayer mode that pits two player-controlled demons against one fully-kitted DOOM Slayer. Featuring all-new streak-based Ranking System with rewards and matchmaking, leaderboards, a new Arena: Stronghold, and the new Dread Knight playable demon.

Two New Master Levels
In the Mars Core and *The World Spear Master Levels, take on remixed demon encounters that introduces a new combat experience. Show the world you’ve mastered these challenges worthy of only the greatest Slayers.

Update 6.66 is available today for PC, Xbox One, Xbox Series S|X, PlayStation 4, and PlayStation 5.

*The World Spear Master Level requires ownership of The Ancient Gods – Part Two.