Roi

https://www.dndbeyond.com/characters/83779966

Restriction Operator Initiative, or RO/I was an attempt to create a battlefield controller during wartime. After being granted independence, they passed into mercenary service and grew obsessed with the uncertainty of a Warforged lifespan. They have been conducting research into the prolonging of their existence, and are seeking the knowledge and path to become a Lich, ensuring their continuance in the world.

The concept for RO/I emerged from the construct nature of warforged, and their uncertainty about their maximum lifespan. I picture them a little like Ultron without access to the internet.