Marvellous Heart

The core and power source of the Mechanical Marvel⁣⁣ invented by Alston Folkor Doublelock⁣⁣. It blends arcane and technological power to function as an indefinite power source for the machine. Alston drafted numerous schematics for this device throughout his career, but unbeknownst to him, his rival Phineas Bertholdt Cloggstomp⁣⁣ stole and sabotaged his research out of jealousy, rendering him unable to complete the Marvel until Phineas, in a deathbed letter and gift, felt remorse for his misdeed and mailed Alston the nearly-completed Heart with some adjustments of his own, which Alston was able to finish and finally activate his machine.
Later, during Session 11 - Between Borders⁣⁣, Alston discovered that Phineas had embedded a number of arcane messages in the Heart, locked behind puzzles, warning of danger and forces interested in Alston's work...