There are four symbols to find in total during chapter 5 in Resonance: A Plague Tale Legacy, and the final one is retrieved after avoiding a spike trap by following certain symbols. Sophia and Leni must go through a giant door, but it's locked behind four symbols. Each door leads to a trial where you eventually find the symbol after completing it. Although the quest says find the last symbol, players can do them in any order. Here's how to complete the spike traps tiles puzzle to get the final symbol in Resonance: A Plague Tale Legacy.
To find the final symbol during chapter 5 in Resonance: A Plague Tale Legacy, you need to memorize a pattern of safe symbols and jump on the tiles that have those symbols. The pattern is Dots → Squid → Dots → Flower → Squid.
Inside the room with the doors, search for the door with the squares and dots symbol.
Go through it to open the door with the help of Leni.
You will get separated shortly after because of a trap, but it's okay. Travel through the area by jumping on the platforms until you reunite with Leni. There is also a nearby charm for Sophia.
Once you reach the top of the area, you will discover a group of enemies trying to solve the puzzle and failing miserably. Attack the soldiers and defeat them to get a better view of the pattern on the ground.
This is the safe pattern you need to remember to pass safely.
This will lead Sophia and Leni to the mechanism that reveals the symbol. Insert the sphere key to finally get the last symbol needed, if this is the final trial you're completing. Proceed forward to fight a bunch of enemies and eventually return to door rooms to put the correct symbol.
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