Web Lock

HUD description: Web Lock (Ancient Lock): Seems to be a holder for 8 of something. Best find that 8 of something! Need: 8 Web Orbs

The Web Lock is an ancient mechanism in Crystal Caverns. You must find all eight Web Orbs to unlock it. Doing so awards the A Door in the Cave? achievement.

Once the door is unlocked, you can proceed through a passage that leads to The Lair in Spooky Woods, where you will meet the Giant Spider boss.

How to get there
From sidewalk level at the canal in The Hall, enter the side passage that's lit purple from below. Carefully jump across the wooden beams to get to the other side, and proceed through a short passage with a berry bush on the right. Drop down through the opening, and make your way down to the floor of this chamber. There's only one doorway at ground level; enter it and take a right. Follow the ramp up and past the lava. The Web Lock chamber is at the top of the ramp.