Hallucinogens are a way to communicate with these powers. Also repetitive dance, self harm, fasting, etc. There is a reason for the ritual. Many ancient cultures feature one or many rituals designed to access higher planes of thought
By using mushrooms and proper preparation some would say that you are able to commune yourself.
Now. Lets get to the meat of this shit. DMT is found in your brain. Most powerful hallucinogen we know of. WHY DOES OUR HISTORY AS HUMANS CONTAIN SO MUCH HUMAN SACRIFICE???????
You kill the body, eat the magic and see the demon. Not all of these powers are benevolent. Mushrooms are a gift and offer grace. adrenochrome type fuckery is theft of the most brutal kind and yields demonic power.
Star wars was destroyed because it touched ever so slightly upon this. But that might just seem like a crazy addendum here.