The phrase "demonic realm" refers to a fictional or metaphorical world or dimension where demons, evil spirits, or malevolent beings exist. It represents a dark and supernatural place associated with wickedness and negative energy. Full definition
An angelic and demonic realm responding to what we think, what we say, what we do, how we act, where we are. (relevantmagazine.com)
This is a real problem while most understand the Bible they don't understand the demonic realm where most of this is coming from. (religion.blogs.cnn.com)
The kingdom of the air can be none other than the demonic realm. (redeeminggod.com)