Towards the end of Resonance: A Plague Tale Legacy's Chapter 6, players will come across a large tomb area with pedestals on both sides of the room and a hatch door with an axe sigil in the middle. This puzzle can be found right after exiting the area where you find Daedalus's Key during "The Architect" subchapter. Here's how players can solve this puzzle to get the secret SICA (Blade) in Resonance: A Plague Tale Legacy.

There's a tomb located in Resonance: A Plague Tale Legacy Chapter 5 that players can open up by solving its puzzle and get the Greek Sword blade.

After players retrieve Daedalus's Key during "The Architect" portion of Chapter 6, they'll follow the critical path to leave the area overlooking the labyrinth. While heading through the tunnel, you'll come across a small opening to the left that you can enter to reach the Tomb puzzle.

Inside the tomb, you'll need to climb the pillar I've marked in the image above. This is the only position where you'll be able to refract light with your Sphere to hit all three colored gems and unlock the hatch door with the axe sigil in Resonance: A Plague Tale Legacy's Chapter 6.

Now, once you're atop the pillar, use your Sphere's ability to cast three rays of colored light . The trick is to first hit the green ray at the green gem, and then rotate the other light rays until they're reflecting off the mirrors in the Tomb area and hitting the appropriate gems.

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