Harlequin Pendulum

Harlequin Pendulum is a legendary Warlock bond. It can be purchased from The Speaker in the Tower for 25 Motes of Light.

Trivia
The Harlequin Pendulum phases between two colours depending on the time of day in the current environment: Yellow during the day time and Blue at night. It can appear White at dawn and dusk.

The bond's glow pulses. It is most clearly seen during the day when it glows Yellow. The pattern of pulses appears to be random, but its possible it might be a stream of binary or Morse code, though this would need to be checked.