There are many ways to call demons and some of them allow for physical manifestation, which is the best way to have a demon appear. Do not attempt any of this if you believe in god or any monotheistic deity or have any association with a monotheistic religion or the demons I refer to will kill you.

Demons are not only powerful as heck, but are very useful tools for a warrior. Nothing good can come of this, so if this is attempted, you can only use this power for evil. The most notable uses are for killing and creating disasters.

My source of information comes from The Inugan Prophecy and it's 160+ summonings for destruction. The book is a Demonic Gnostic Text, probably from the deepest pit of Hell since the entire book obsesses about absolute power, how to obtain it and abuse it. There are no moral codes on how the power should be used, so it's the best path to enslaving demonic forces. This spell has worked very good at controlling demons in Hell and does just as good on any malevolent spirits and astral ETs.