The Prince of Darkness is not a creator god in the sense of creating the physical world, or – using the terminology of the Temple of Set – the objective universe. The creation of the Prince of Darkness is the individual subjective universe.
The Gift of the Prince of Darkness to the humanity is the possibility to become aware of this. Once you awaken to the creation of the inner universe, and once you have worked through the initial confusion that arises from the awakening, putting forth a considerable amount of work, you see that this creation of the Prince of Darkness was not complete. Rather it was an opening, and once it had been done, the space thus created has been filling up with other influences: external influences from other subjective universes or from the material objective universe, and inner influences of the mechanical nature of your human self.
This is where you are at a crossroads. For another possibility arises: that you can have the same creative power over your inner universe – that in this you are kin to the Prince of Darkness.
Working through the material that has been amassed in your self, exerting the power of creation and destruction according to your needs, desires and curiosity, you will become de facto creator of your universe.
What changes you bring to your inner universe will begin to take form also in the outside objective universe and in the subjective universes of other beings. Part of this process is very natural: as you change and interact with the world around you, those changes will be reflected. But there is a more subtle part, that of your inner core sending out influences that have a more indirect effect. In this you participate in the greater magical current of the world, the real Work of the Prince of Darkness.
The essence of any magical action is to create your own universe, and in so doing you will also help the creation of that which is beyond you.