You are no longer a tinker, instead your specializations/focus is funneled to your RTS power. You gain the ability to produce units/building and a tech tree for factions your Tinker of Fiction power currently provides a specialization for. It also doubles the rate of research you can undertake and the speed of which your forces build. You can also undertake special research to bridge the gaps between different specializations, though these take longer than to complete the greater the disparity between them.