Chained Beasts Bosses: Acts, Achievements & Verified Facts

Which bosses are confirmed in official sources?

Featherweight confirms a boss ladder across three acts plus additional achievement-only names. The table below sticks to store, news, PR, and achievement text—not community nicknames.

Generic rule: Who’s The Boss — kill a boss within 10 seconds of first damaging it. That timer is the only numeric boss constraint in achievement text.

New players should read the Chained Beasts beginner guide for chain basics before diving into act bosses.

What does official art show for named fights?

Screenshots and trailer frames do show some boss UI:

Official Steam store screenshot. © Featherweight Games.

Official Steam store screenshot. © Featherweight Games.

Praefectus, catapults, and mangonels do not appear in the official Gameplay Trailer frames we reviewed (see Praefectus page). Do not substitute other Rome art for siege mechanics.

Who is the Flail Master?

Achievement Turning the Tide: Send the Flail Master flying with his own flail.

Official announcements do not say which act or arena hosts this enemy. Gameplay Trailer footage includes a large armored figure swinging a flail against chained players in snow, but the frame has no boss nameplate—so we describe the clip as an unnamed flail enemy, not as confirmed Flail Master footage.

Frame from the official Gameplay Trailer. © Featherweight Games.

For chain-heavy teamwork context, see co-op and multiplayer. Achievement hunters should cross-check wording on the achievements guide.

What is The Senate?

Achievement Rebel Leader: Reach The Senate. Official structure lists Rome as the third act with this milestone on the boss table above. Our reading of the wording (not confirmed in-game): reaching The Senate marks completing the Rome act arc described in launch announcements—not a separate hidden act name in public UI text.

Official cinematic art shows a robed figure on a golden throne, legionaries on steps, and the letters S P Q R on a pediment. The frame does not display the words The Senate, so we caption it as a story cutscene, not a screenshot of the Senate boss encounter.

Frame from the official Gameplay Trailer. Cutscene—not a labeled boss fight UI. © Featherweight Games.

Act progression achievements Can’t Stand The Heat (survive Carthage) and Out of the Cold (survive Germania) bracket the road toward Rome. Difficulty tier Jupiter and King of the Gods are documented on difficulty levels.

How do Beastmaster Barca and the rhino relate?

Store achievements tie Barca to his mount: Stampede requires Barca to die by rhino trample. A separate cinematic render shows an armored rhino bursting through a gate with purple shields; that frame lacks Barca’s nameplate, so it is not labeled as the Barca arena in our captions—see the Barca boss page for details.

Frame from the official Gameplay Trailer. Cutscene render—no Beastmaster Barca UI. © Featherweight Games.

Sources and verification

• Sources: Featherweight Games Steam store page; Steam Community announcements; Steam achievements list; official Steam store screenshots; official Gameplay Trailer frames (Steam store, Steam achievements).
• Verified: 2026-10-16. No boss HP, phases, or exploit routes appear in those sources, so this overview stays descriptive.
• Images: Official Steam store screenshots and trailer frames, © Featherweight Games. Used for identification and commentary; removal on request.

Chained Beasts Guide is an unofficial fan site and is not affiliated with Featherweight Games.