How I Finally Bested the First Sinner in Silksong (And You Can Too!)

Let’s be real: by now, you’ve probably heard the legends. The First Sinner isn’t just a boss in Hollow Knight: Silksong — she’s a rite of passage. I still remember my first encounter in 2026, swaggering into the Slab with a fresh needle and zero clue that I was about to get turned into a pincushion. After all, how hard could one hidden boss be? Ha. Oh, sweet summer child.

Up there with Phantom, the First Sinner is one of those rare fights that feels like a perfectly choreographed dance — except you’re the one constantly tripping over your own silk. Fast, fair, and utterly relentless, she’ll keep you on your toes from the first silken spear to the final fake-out victory. But here’s the kicker: she’s so well hidden that you could finish Act Two without ever meeting her. That, my friend, would be a tragedy. So grab your needle, channel your inner Hornet, and let’s right that wrong.

The Great Apostate Key Treasure Hunt

Finding the First Sinner is an adventure in itself. You might stumble upon the Slab region early in Act One, but the giant locked door at the bottom near the Bellway station will mock you mercilessly. Why? Because you need the Apostate Key — and it’s absolutely not in the Slab. I mean, where would be the fun in that?

To get it, you’ll need to pay a visit to the delightfully gross Putrified Ducts. But wait — don’t even think about venturing there without the Faydown Cloak, found atop Mt. Faye. Tough, I know. There are two ways into the Ducts: via Memorium (above the Citadel’s Choral Chambers) or from the top of Bilewater after putting Groal the Great in his place. I personally favour the Memorium route because it gives me a chance to hum along with the choir. Don’t judge.

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