In a post published on October 23, the PlayStation Blog went behind the scenes of the boss fights in Saros, written by Nixxes game director Micah Hrehovcsik and Housemarque creative director Gregory Louden. It also points players to the Zenith update, which adds a new mode built around those fights.

Two studios, one set of bosses

According to the post, Housemarque supplied the creative vision, the world, the combat language and the bullet-hell style it is known for. Nixxes then brought the bosses to life through encounter design, animation, environments, lighting and technical work. Housemarque handled boss concepts, visual direction and effects, while Nixxes focused on boss behaviour and attack implementation, with Housemarque doing the final review.

Each boss started with a briefing, then Nixxes pitched its own take and built early prototypes. The fights were refined through iteration, playtesting and polish until shipping. The post describes them as fully staged encounters, not just enemies with larger health bars.

The design rules

The developers say every boss has three distinct phases, each changing how the fight looks, feels and plays. A typical fight lasts about three to eight minutes, and the difficulty comes mainly from boss behaviour, arenas that transform, hazards, bullets, beams and physical attacks.

The attacks are meant to push players to use shielding, jumping, parrying and dashing. In the team’s words, a good attack should make players move with intent, not in panic.

The team also lists four questions it asked whenever a player lost:

  • Do they understand why they lost?
  • Do they know what to do differently next time?
  • Did it feel like their own mistake rather than something unfair?
  • Do they want to try again?

The post then walks through the five major bosses with spoiler warnings, so we are leaving those details to readers who have finished the game.

What the Zenith update adds

The post says players can return to these battles in Overlord Rush, Housemarque’s new mode, and play them in a faster and more replayable form. The post says Saros: Zenith has a tighter arcade experience, and it points to a Leaderboard to climb.

Gematsu, reporting the announcement on September 3, 2026, describes Overlord Rush as an arcade style mode where you fight the Overlords back to back for high scores, with integrated leaderboards. The update also includes Eclipse Layers, a New Game Plus mode that restarts the game in a harder form with Carcosan Modifiers, new secrets and new trophies, plus new visual and control options. Push Square lists high contrast visuals, gyro aiming and a slow game speed option.

Push Square called the update free when it was announced. The PlayStation Blog’s trending list now shows a post dated October 19 saying the Zenith update is out. Neither source states Canadian or US pricing in dollars, and the Canadian date is not stated separately.

What it means for readers

Saros is a PS5 game, so Zenith matters to owners in Canada and the United States who have finished it and want a quick, score based way back into the boss fights. Newcomers get the accessibility options and the extra difficulty tools. Check the PlayStation Store listing for your region before downloading.