From the Publisher's website:
Mastercraft rules are easier to remember so there’s less reference at the table, and easier to use so no complex calculation is needed to get from decision to result. Everything you love is here — action dice, campaign qualities, scalable NPCs and adventures, extremely competent characters out the gate, new things to do every single level, tightly scripted universal game balance — and there are plenty of new innovations, like narrative control (which allows anyone to define the world — but not contradict it — in their favor) and cheating death (allowing players and GMs to cooperatively advance the story while sparing a hero an untimely demise).