This is the Skill that makes a man handy; possession of Repair Skill gives one the chance to repair a plethora of Technological and smithied items, from swords to steam engines to Tesla guns.

Repair Apprentice reduction of max HP's is only 5%

Repair Expert reduction of max HP's is only 1%

Repair Master there is no reduction of max HP's except on a critical failure. A Repair Master can fix broken items (items reduced to 0 hit points) but always at a cost of 5% of max HP's.