What is it with you and all these occult movies!
I haven't seen this one but looks intriguing. Have you seen Kill List? If not, you really, really must. If you like films featuring the occult that is
Definitely give it a watch! The ritual is actually based upon an actual ritual called the Abramelin operation.
The Abramelin operation involves a period of withdrawal from society, focused daily prayer and meditation, and a number of other moral guidelines similar to those found in Monastic traditions around the world. It’s broken down into progressive phases of increasingly diligent practice. The text advises against regarding the hour, day or month, or other socially-rooted habits. It also forbids the practice of any other system of magick that may be in any way contrary to the Abramelin Operation. In the Mathers translation from the incomplete French version, the phases last for two lunar cycles, each for a total of 6 months. In the original translation, the phases are much longer, the whole operation totaling 18 months. So, it is a VERY long and grueling ritual. One of the longest and most grueling ever created in order to contact your Holy Guardian Angel. And not everything can go right or the way you want it to. It can destroy the closest relationships you have with others and the things you own such as your house. I've never been one to want to attempt such a ritual but some do and some have completed the ritual coming out a totally transformed version of oneself intellectually.
Ritual practice like this can be dangerous though because your dabbling in Goetia (dark magick or summoning of demons). I wouldn't be the first to attempt something like this, that's for damn sure.