You have some vision, perhaps of divine origin, perhaps just a personality quirk. You wholeheartedly believe in this vision, and you have a strange power of attraction, gathering followers and creating enemies of this new vision of yours.
Your vision appeals to a certain type of people, few of them are unaffected by it. It might be a vision to liberate all slaves or to reform a religion, and all slaves and slaveowners or all who believe in the religion will be very much concerned. In this way, you will quickly gather followers, but you have very little control over their actions. They will hold you in high esteem, as a spiritual guide and mentor. You also get enemies.
This is a schtick for great visionary leaders, like Martin Luther King and Mahatma Gandhi, but also of tyrants such as Adolph Hitler. It makes you very much the center of the campaign, and should therefore only be taken with the GMs permission. Generally, visionaries tend to be NPCs who the PCs are either to help or hinder.