I should clarify: It’s not about power, it’s about vibration… these are two different things. Hiding doesn’t need as much strength as fighting.
One is amplitude the other is frequency. In the same way that humans don’t have the eyes to see ultraviolet light, but bees do, for example, the lesser entities literally can’t see you if you raise your vibration above what they are looking for.
Also, there are many kinds of non physical entities, including what I call astral wildlife. An imp is a lesser entity, for example. A shadow person is, imo, a lesser entity, and alien is a lesser entity, and humans in ego consciousness are lesser entities. Lesser as in, doesn’t have the same understanding and access that deity level or cosmic entities do.
But cosmic entities tend not to go around randomly attacking people, so if you’re being attacked without provocation, and without this being sent by another mage, then by definition it’s a lesser entity and you are within your rights to kill it.
Yes, this needs some power, by which I mean how much energy you can bring to bear all at once.
We have some info in the parasites collection of threads, but in a nutshell, the element of fire works very well. If you can visualise, get into trance, see the entity in form, and see it burning up. It will run or it will die. If you really want it to die, you can trap it in place (see a metal cage or hold it yourself in your arms) and hold it while you burn it.
By trying, you gain practice and get stronger at it, you gain power, or rather, you will use your energy but you build the capacity to hold more… so try and keep trying until it works, and it will.