Last updated: 26 July 2026

All Silksong Bosses in Order (by Act)

Silksong is packed with bosses — 43 unique base-game encounters and even more rematches across its three acts. Some block your path forward, many are optional challenges, and a few are hidden behind quests. This guide lists the major bosses act by act so you can track your progress and know what is coming. It covers base-game content (v1.0.29926); the Sea of Sorrow expansion adds further boss encounters not listed here. Mild boss-name spoilers follow.

01How Boss Progression Works

Silksong's bosses are split across a clear three-act structure:

• 43 unique bosses in the base game, with a handful of rematches bringing the number of fights higher.
• Around 18 are mandatory to finish the story; the rest are optional challenges, hidden bosses, or quest-related fights.
• Act 1 covers Pharloom's outer regions, Act 2 climbs the Citadel of Song, and Act 3 is an opt-in finale.
• Colosseum Trials (three escalating tiers) are the closest thing to a boss-rush mode in the base game.
• Team Cherry has patched some bosses since launch to adjust difficulty, so a fight may be easier than older guides describe.
• The Sea of Sorrow expansion (free DLC, coming 2026, not yet released) adds further boss encounters in new nautical areas not covered in this list.

02Act 1 Bosses

Act 1 introduces the core challenge curve and ends at a major gatekeeper. Key bosses include:

• Bell Beast — an early teaching fight.
• Moss Mother and Sister Splinter — early-region challenges (Sister Splinter was eased in a post-launch patch).
• Lace — your first duel with a recurring antagonist, fought in the Deep Docks.
• Widow, Moorwing, Savage Beastfly, and Skull Tyrant — a mix of mandatory and optional fights.
• Phantom — a boss on the alternate route to the Citadel.
• Last Judge — the Act 1 finale that opens the gate to Act 2.

The Last Judge is the wall most players hit first — see our dedicated Last Judge guide for the full strategy.

03Act 2 Bosses

Act 2 takes you up into the Citadel of Song, with tougher, more elaborate fights:

• Lace (rematch) — a harder second duel later in the act.
• Trobbio and the Cogwork Dancers — standout set-piece bosses.
• First Sinner, Shakra, and Garmond and Zaza — quest- and story-linked encounters.
• Grand Mother Silk — the Act 2 finale and a major story turning point.

How you approach the Grand Mother Silk fight matters for the ending you get — completing the Act 3 unlock quest beforehand is what opens the true path. See our endings guide for details.

04Act 3 Bosses

Act 3 is the opt-in finale, set in a corrupted version of Pharloom, and contains the hardest fights:

• Skarrsinger Karmelita, Nyleth, Shrine Guardian Seth, and Crust King Khann — late-game challenge bosses.
• Bell Eater — another Act 3 encounter.
• Lost Lace — the true final boss, the culmination of Lace's arc.
• Reaching these requires completing the Act 3 unlock quest first, so many players never see them on a first run.

Lost Lace is the toughest fight in the game and the gateway to the true ending — our Lost Lace guide covers it in full (with spoilers).

05Optional Bosses & Colosseum

Beyond the story path, plenty of bosses reward exploration:

• Optional world bosses are tucked into side areas and behind secrets across all three acts.
• Colosseum Trials come in three tiers (Apprentice, Warrior, Legend) — escalating arena gauntlets that are the base game's boss-rush equivalent.
• Many optional fights drop Tools, currency, or upgrades, so they are worth seeking out.
• There is no built-in Pantheon mode in the base game as of launch, though community challenge content exists on PC.