• Third fresco [LORE, Mythos]

Use your Mind's Eye (a special ability to see hidden things) to dispel another illusionary rock face.

Proceed into the inner temple cavern.

Interact with Professor Harriet Dough. You will have several dialogue options: "Name's Charles Reed.", "Tell me about the cycle.", "What gates?", "Are you feeling alright?", "What do you see?", "I have visions too...", and "Give me a moment.".

After the conversation, you will receive a new Mind Palace clue: [The Prophecy].

Open your Mind Palace (a mental space to connect clues).

Combine the clues "Another vision" and "The Prophecy" to make the deduction: "I might be one of the Chosen".

Combine the clues "EOD planned the kidnapping" and "The Prophecy" to make the deduction: "Harriet might be one of the Chosen".

Combine the clues "One Savior" and "The Prophecy". This will lead to two possible sets of deductions:

• "Only one may survive" AND "I must kill Harriet Dough"

OR

"Only one may remain" AND "I must save Harriet"

Interact with Professor Dough again. You will have dialogue options: "We need to leave." OR "I will be the one who remains.".

Interact with the Seal on the plinth in the center of the dais. This will trigger hallucinogenic events and reveal the "Seal of Cthygonnaar".