I would give you quotes from guru granth sahib that refer and talk about spiritual powers, demons, other entities etc. But i am not sure if you have already studied guru granth sahib or not?
The more your spiritual level is awakened, you become more present in the sense things become more clear. What we have now is false but we don't believe it because we're limited to your spiritual level at this time to thinking our body is our body when reality is the deathless soul we have is our trueself. To come to this realization takes a lot of dicipline and meditation (takes life times to come to this realization, everything happens in our own pace, some are more ready to accept the will of guru sahib then others but guru sahib allows us take the time it needs for us to be ready for him)
This is why guru sahib's bani is the most powerful, came straight from sachkand, created great warriors and saints (baba deep singh, bhai mani singh etc.).
Black magic, powers, are all real but above all this is the love of guru sahib which should matter the most.