Echoes of War
Clear, crystalline orbs about a foot in diameter, Soul Keys weigh about 2 pounds. They were used by the Technic League to activate the Soulforges where the Warforged were made. The purpose of the Soul Keys in Warforged creation was never revealed, but it has been theorized that they were crucial in granting the constructs free will.
After the Vallows Treaty was signed, the four known Soul Keys were ordered to be taken to Vallows Keep. Three of them were transported via Lightning Rail while the fourth was taken over land by the Red Raven Adventuring Company. The final Soul Key never made it to Vallows Keep. Instead, Allistair Kaine secreted the Key away near Rebel’s Forge. Recently, this key was stolen from its hiding place by the party.