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First Sinner

The First Sinner is an optional Silksong boss in The Slab, an ancient Weaver condemned for apostasy who rewards Rune Rage.

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Verifiedfor Current version
Checked by HostedGG Team on Jun 19, 2026
Updated 3 months ago
Boss
First Sinner
Region
The Slab
Act
Act 2-3 (optional)
Reward
Rune Rage Silk Skill

The First Sinner is an optional boss locked behind three keys in The Slab, an ancient Weaver condemned for apostasy. It telegraphs silk-wrapped needle plunges, teleport slashes, and second-phase rune detonations, and dangerously it heals itself if it manages to bind Hornet, so you must avoid its snares. The reward is the Rune Rage Silk Skill. It is one of the hardest optional duels in the late game.

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Current version
Verified for
Jun 19, 2026
Checked
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