Helldivers 2 has received its first crossover DLC and added Killzone 2 cosmetics.

The crossover is part of a new tier of special premium content, according to a post from developer Arrowhead, suggesting that more collaborations are planned.

“We decided a long time ago that we would only do crossovers when they made complete sense for the game,” the Steam post reads. “With that in mind, we’re excited to announce our first-ever crossover: Killzone 2.”

Available now in the Superstore are a new armor set, a new primary weapon, a player banner, a cloak and a new player title.

A second batch will then be available from December 23rd.

The post also hints at other content: “High Command informs us that in addition to the Superstore content, there will also be an additional Killzone 2 reward for all Helldivers depending on your success in the Galactic War…”

The collaboration also marks the start of a longer rotation of items in-store, as Arrowhead temporarily tests a five-day rotation.

“Right now, many of you feel like the items are out for too short a period of time and that you’re sometimes missing out on the stunning look you’ve been eyeing,” it said. “At the same time, the more items we add to the store, the longer it will take to get it back into rotation.”

After collaboration, page rotation in the store will return to normal as the developer collects feedback.

Last week a limited edition Helldivers 2 controller was revealed.

Killzone 2 was published by Guerrilla Games for the PS3 in 2009, published by Sony. This was followed by Killzone 3 in 2011, Killzone: Mercenary on the PS Vita in 2013, and then Killzone: Shadow Fall for the PS4 release that same year.

Since then, there has been no word about a new game in the series.

In fact, Guerrilla art director Roy Postma suggested in October that the studio was done with the series and created Horizon Zero Dawn to “refresh the palette.”