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The First Sinner is one of the toughest bosses in Hollow Knight: Silksong, demanding fast reflexes, aggressive play, and excellent movement. Unlike many bosses in Pharloom, the First Sinner can heal mid-battle, forcing you to stay on the offensive or risk losing progress.

This guide covers where to find the First Sinner in Silksong, her attack patterns, and the best strategies to beat her.

Also Check: Hollow Knight Silksong Ruined Tool Guide: How to Repair It and Unlock the Silkshot

Also Check: Hollow Knight Silksong: How to Complete the Infestation Operation & Rite of Rebirth Wish

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Where to Find First Sinner in Hollow Knight Silksong

To challenge the First Sinner, you’ll need to unlock her sealed chamber:

• Collect three special keys:
• Key of the Apostate
• Key of the Indolent
• Key of the Heretic
• Travel to The Slab, located near the Bellway Station.
• From the bench, head into the hidden room through the ceiling to the right.
• Break the four silk runes sealing the chamber to awaken the First Sinner.

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First Sinner Attack Patterns

The battle against First Sinner is divided into two distinct phases:

Phase 1 Attacks

• Scuttle Attack – Rushes across the arena, slashing forward.
• Slice Attack – Teleports above and dives diagonally.
• Cross Stitch – Summons two crossing needles.
• Forward Needle – Summons needles horizontally.
• Falling Needle – Drops a rain of needles from above.
• Bind – Attempts to heal (must be interrupted).
• Teleport – Warps to reposition quickly.
• Skitter – Retreats if Hornet stays too close.

Phase 2 Attacks

• Rune Rage AoE – Multiple circles appear on the ground and explode one after another.
• Enhanced Speed – Phase 1 attacks return, but much faster.

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Strategy to Beat First Sinner in Silksong

The First Sinner is aggressive and relentless, but with the right approach, she can be overcome:

• Stay Aggressive – Never let her heal. Interrupt every Bind attempt immediately.
• Use Tools – Items like Pollip Pouch and Cogflies are great for constant chip damage.
• Healing Windows – Safest after dodging Scuttle or Slice attacks.
• Phase 2 Awareness – Prioritize dodging Rune Rage AoE explosions. Don’t get greedy with attacks—let your tools whittle her down.
• Movement Mastery – Keep moving to avoid diagonal and vertical needle strikes.

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Tips and Tricks

• Practice movement skills before attempting this fight.
• Constantly reposition to avoid her fast teleports and needle barrages.
• Healing is limited—time it carefully.
• Stay patient in Phase 2; her attacks are faster but predictable.

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Reward for Defeating First Sinner

Beating the First Sinner unlocks Rune Rage, the same AoE explosion ability she uses during Phase 2. This powerful skill is a game-changer for clearing enemies.

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The First Sinner boss fight in Silksong is a true test of precision, aggression, and adaptability. By mastering her attack patterns, staying relentless, and interrupting her heals, you’ll eventually bring her down and claim Rune Rage for yourself.

If you’re struggling, don’t be discouraged—this is one of the hardest fights in the game, and persistence pays off.