WB Games and developer Turtle Rock Studios have announced that the first expansion for Back 4 Blood will release on April 13, bringing with it a new PvE activity, characters, weapons and more, check out the below infographic to get an idea.

When the Back 4 Blood Tunnels of Terror expansion arrives on April 13, teams of up to four friends can jump into an all-new co-op activity known as Ridden Hives, where they will explore seven different dungeons full of labyrinthine tunnels below the depths of Evansburgh that are infested with a new Ridden type, Warped Ridden. To claim exclusive loot and rewards only offered in Ridden Hives, players must outmanoeuvre and overcome the daunting new Warped Ridden, including the landmine-setting Urchins, monstrous Shredders, and damage-dealing Rippers. The new Warped Ridden variants are also playable in PvP Swarm mode.

Part of the expansion is the inclusion of two new cleaners, Sharice and Heng, check out their posters below.

But for all the good guys that get added, there are some bad:

Tunnels of Terror is included with the Back 4 Blood: Ultimate Edition and Back 4 Blood: Deluxe Edition, or for those who have bought the season pass. If you want to buy this on its own, you can also do that.