The most alluring aspect of being in the power is establishment of eternity. In short they want to conquer past, present and future. In other words, it is about being omnipresent in time domain i.e. past, present and future.
There is a saying that anything that can be imagined can be converted into reality. So, the questions on practicalities of being omnipresent in time domain are quite secondary. It is an art mastered by astute and out of bounds by the individuals who are out of sync with spiritual inner world.
Being omnipresent in time domain denotes the aspect of attaining eternity. The concept may be intriguing but nothing new to Indian culture where we have hundreds of gods being worshiped in different forms who are indeed those astute being a master w.r.t. the art of being omnipresent in time domain.
Tamil superstar Rajni Kanth says that if we know the time of our death, our time of living will turn into hell. Being omnipresent in time domain doesn't necessarily mean we know happenings of past and future. Instead it is simply an attempt to make our present time be in sync with past and future without any discontinuities in between.