How to develop through the skill wheel on the path to the ultimate ability

By the way, once you have acquired the 4 necessary primary skills, you should then acquire the secondary skills you need. Leave an empty slot for a primary skill (if the hero allows it) as a precaution. Otherwise, the system might play a trick on you and offer secondary skills that overlap with the ones you need. In that case, fill the slot with a primary skill (even if it's not the one you need).