Black Talaria Card
Warning This Section Does Contain Spoilers
*Note - The black Talaria card originally was mailed between episode two and episode three, but when buying the box set it comes with episode two, or is emailed to you.
The black Talaria card has the word "Xlmtivtl" written on it. Using the atbash cypher once again we can translate this to mean: Congrego
Congrego is the Latin word for "gather".
Entering the word Congrego into the Whispers From Theodorus website we find the Congrego file and use password "Gather" to access.