It can be clearly said that there is no skill to improve skills, because there is a probability to improve skills every time. However, we can choose which skill to upgrade. I have been playing factionalism for more than three years. Factionalism has changed a lot from the group battle between families at the beginning to the present grabbing of red envelopes. As for skills, I value "expelling families" and "grasping magical powers" most. I had a good time in the team battle of "expelling the family", and "grabbing the magic" was to better complete the daily goals and tasks. Share a tip. Don't save it every time to upgrade your skills, or upgrade it frequently from time to time. Don't save enough stars to go up at once, because you feel more likely to fall down.