Ryoko's Guide to the Yokai Realms, pg 219
You can tinker with your prosthesis, manipulating its function over the course of an hour, which can be done as part of a short or long rest. Doing so enhances it by adding one of the following properties:
• Blast (1d6 thunder, 20 ft.). The prosthesis gains the Piercing Shot superior strike.
• Hookshot (30 ft.)
• Integrated (any)
• Launch (1d6*, 30 ft.). The prosthesis gains the Battery Strike superior strike.
• Melee (1d8*, 5 ft.). The prosthesis gains the Reeling Blow superior strike.
• Mobility (climb or swim, 30 ft.).
The modification lasts until you tinker with your prosthesis again.
*Bludgeoning, piercing, or slashing (choose when you make this modification)