Once again, Tripwire Interactive is bringing the goods with a new holiday update for Killing Floor 2. The Yuletide Update, which is launching today, will introduce a new community map called Sanitarium, along with a new objective map called Biotics Lab, two free and two paid new weapons, and the return of “zesty” Christmas Zeds.

The biggest addition this year, however, is Rachel Clamely, making her Killing Floor 2 debut as a tough new boss known as The Matriarch. The story goes that Clamely is the daughter of Kevin Clamely, the former CEO of Horzine, the company responsible for the outbreak of Zeds. After unleashing the Zeds, Clamely mutated himself into the monstrous Patriarch. Rachel helped bring down two clones of the Patriarch in the original Killing Floor, but like her father, she’s now mutated herself.

“The Matriarch is a multi-stage boss that builds on and combines previous mechanics from other bosses,” Tripwire explains. “That being said, the Matriarch has a unique few tricks of her own. The boss battle is built on 4 primary phases, each tied to the different states of her health bars, broken up by escalating waves of E.D.A.R.s enemies that are added into the fray as she enters a new phase.”

As for the hardware you’ll be getting to bring her down, players will be gifed with the HRG Incision for the Field Medic, Winterbites for the Gunslinger, the Mosin Nagant for the Sharpshooter (though this is a paid DLC weapon), and the Riot Shield / Glock 18 combo for SWAT.

And yes, it wouldn’t be Christmas without the return of Gary Busey’s Badass Santa, who is back as a purchasable playable character. Also, stick around after the teaser trailer for a special surprise that Tripwire has in store for the game next year.