Merchant of Mammon:
The power to move between planes, child!
We first used it to travel from Necropolis to Necropolis, but soon augmented our device to allow us travel on a different axis: time itself.
We called it 'The Promise of Mammon'. It was the most powerful creation in Aden's history, and a tool that Emperor Shunaiman was granted access to in that contract of ours.
"Where is it?"