From publisher blurb:
Everybody's got a lucky item. For some people, it's a lucky coin. For others, it's an old engagement ring they keep on a chain. And for some, it's the bullet that barely missed their heart. These items have significance to the individual, and that significance weaves the item with the person's luck. Some people see the importance these items play, and they learn to manipulate people's luck. They call these items mementos.
This is the first spirit-based crafting skill released for Tephra: the Steampunk RPG. It includes 7 new Luck specialties and 48 new augments.