Dark Spirit Summoning

This is a spell from The Grimoire of Pope Honorius. 
== Preparations ==
Before casting this spell, the spellcaster must spend 3 days fasting, confess their sins, and approach a church altar.Unknown. The Grimoire of Pope Honorius. Edited by Tarl Warwick (2015). p.4 
After these three days, at the next sunrise, the spellcaster must drop to their knees and recite the Seven Gradual Psalms, along with the accompanying litanies and prayers. For the rest of that day, they must not drink any wine or eat any meat. 
At midnight on the first Monday of the month, they should have a priest recite the Mass of the Holy Ghost. When this is done, the spellcaster should take the priest in his left hand, drop to their knees, and recite the following prayer:"My Sovereign Saviour Jesus Christ, Son of the living God! Thou who for the salvation of all mankind didst suffer the death of the Cross; thou who, before being abandoned to thine enemies, by an impulse of ineffable love didst institute the sacrament of thy body; thou who hast given to us miserable creatures the privilege of making daily commemoration thereof; do thou deign unto thine unworthy servant, thus holding thy living body in his hands, all strength and ability for the profitable application of that power with which he has been entrusted against the horde of rebellious spirits. Thou art their true God, and if they tremble at the utterance of thy name, upon that holy name will I call, crying Jesus Christ! Jesus, be thou my help, now and for ever! Amen."
Once the sun has risen, the spellcaster must kill a black cockerel, making sure to take the first feather from its left wing and keep it safe for later in the spell. The eyes, tongue, and heart of the cockerel must be torn out and dried in the sun. Once they are dried, they should be powdered. For the duration of this day, no meat can be consumed, nor can wine be drunk. The rest of the dead cockerel must be buried in a secret place at sunset, with a 1 palm-long (~22.3cm) cross being set on the resulting mound, while the above signs are to be traced at each of the corners of the mound using the thumb.Unknown. The Grimoire of Pope Honorius. Edited by Tarl Warwick (2015). p.5
At dawn on Tuesday, the spellcaster must say a Mass of the Angels, and place the feather taken on Monday on the altar, alongside a new penknife. The accompanying symbols must then be inscribed on a sheet of clean, unused paper using consecrated wine. This should be done during the Mass of the Angels, and the inscribing should take place with the paper on the altar. Once the mass ends, the paper should be folded and placed in a veil of violet silk, along with the feather, penknife, and a piece of the spellcaster's body, in such a way as to make them not be visible from outside the veil. 
== References ==