
I've noticed that most guides just get it done without really pointing out what's happening. So in case you're having trouble following them here's my more comprehensive guide.
So there's a new mechanic for the Chasm called the Unique Rocks. (such a unique name MiHoYo)

Now from most videos and the gif I put above you'd think all you have to do is hit the nearby Unique Rock Pillar and that's it. But it's more complex than that.

You see how here I hit the pillar but it didn't break the Unique Rock to open the Domain. If you look carefully that's because the pillars aren't close enough to the Unique Rock so the resonance doesn't reach it.
So for this one it's easy. There's actually a weight platform that's placed right where you need to set up a Geo construct.

But that's the second issue. So when you place the Geo construct the platform activates a wind tunnel path back to the pillar. So you head to the pillar and hit it. The resonance starts again but still nothing. This could just be a mobile issue but what's happening is that you are too far from the Unique Rock so it's not triggering the reaction of the rock getting hit by the resonance.

So the trick is to place the construct. Go to the pillar. Hit the pillar. Then race back to your construct so that you're close enough to see the resonance hitting the Unique Rock and break it.
I hope this helped anybody that got stuck. And have fun farming the new Artifacts!

Tips and Tricks from a Super Casual Genshin f2p
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