From Grimorium Verum:
The Invocation [of the demon itself].
This is the Invocation:
HELOY + TAU + VARAF + PANTHON + HOMNORCUM + ELEMIATH + SERUGEATH + AGLA + ON + TETRAGRAMMATON + CASILY.
“This Invocation is to be made on virgin parchment, with the characters of the Demon upon it, which causes the intermediary Scirlin to come. For from this depend all the others, and it can constrain them to appear in spite of themselves, as he has the power of Emperor.”
Here, we can see that the invocation is much simpler; instead of role-playing as King Solomon and invoking divine, angelic powers to guide a demon to you, one invokes “Scirlin” as an intermediary.
Rather than using the complex apparatus of a circle and triangle and a brass container, the focus in GV is on the parchment and sigil. I strongly suggest that in doing operations based on the Ars Goetia, one uses a similar approach.
Scirlin resembles the Holy Guardian Angel found in Abramelin. Scirlin, like the HGA, is underdefined and very personal (or so subjective as to be deliberate vague). Their resemblance is that one uses both as a tool for magic. The GV and Abramelin differ in that the core visual method of operation in Abramelin are magic squares.
“In the day and hour of Mars [Tuesday] the Moon being at the crescent, and at the first hour of the day—which is a quarter of an hour before sunrise—you will prepare a piece of virgin parchment, which shall contain all the characters and the invocations of the spirits which you wish to produce.
For example, in the said day and hour, you will attach to the small finger of the hand (which is the finger of Mercury) a thread spun by a virgin girl, and pierce the finger with the lancet of the Art, to get blood from it, with which you form your Scirlin character, as is given at the commencement of this book. Then write your invocation, which is that which follows.”
Invocation to Scirlin.
HELON + TAUL + VARF + PAN + HEON + HOMONOREUM + CLEMIALH + SERUGEATH + AGLA + TETRAGRAMMATON + CASOLY.
“You must write the first letter of your name where is the letter A [in the sign & character of Scirlin], and that of your surname where is the letter D. The spirit Aglassis, whose character it is, is very potent to render you service, and will cause you to have power over the other spirits.” [pictured below]
Make above the Character of the Spirit that you desire to come, and burn incense in his honor.
Then make the conjuration which is addressed to the spirit that you want to cause to appear, and burn incense in his honor.”
As with before, the integral part of the Grimorium Verum operations is not the relationship with Scirlin, but rather the relationship with the sigil being used. Scirlin itself has no sigil given; if one wishes to use Scirlin as an augoeides, one certainly can. But in this case, the invocation [to Scirlin] needs to be planetary (so a Hexagram ritual or Star Sapphire works well).
Just as with Ars Goetia, use a scrying medium to evoke. This time, one is building rapport with an entity that turns into an on-going relationship. The terms you state in the operate will determine this relationship.
Conjuration for Lucifer.
Lucifer, Ouyar, Chameron, Aliseon, Mandousin, Premy, Oriet, Naydrus, Esmony, Eparinesont, Estiot, Dumosson, Danochar, Casmiel, Hayras, Fabelleronthou, Sodirno, Peatham, Come,
Conjuration for Beelzebuth.
Beelzebuth, Lucifer, Madilon, Solymo, Saroy, Theu, Ameclo, Sagrael, Praredun, Adricanorom, Martino, Timo, Cameron, Phorsy, Metosite, Prumosy, Dumaso, Elivisa, Alphrois, Fubentroty, Come, Beelzebuth, Amen.
Conjuration for Astaroth.
Astaroth, Ador, Cameso, Valuerituf, Mareso, Lodir, Cadomir, Aluiel, Calniso, Tely, Plorim, Viordy, Cureviorbas, Cameron, Vesturiel, Vulnavij, Benez meus Calmiron, Noard, Nisa Chenibranbo Calevodium, Brazo Tabrasol, Come, Astaroth, Amen.
After having said seven times the conjuration addressed to superior spirits, you will see the spirit at once appear, to do whatever you desire.
Dismissal of the Spirit.
When you have written the conjuration on the virgin parchment, and have seen the spirit, being satisfied, you can dismiss him by saying this:
Ite in pace ad loca vestra et pax sit inter vos redituri ad mecum vos invocavero, in nomine Patris + et Filii + et Spiritus Sancti + Amen.
[Go in peace unto your abode and let there be peace between you and I, and be ready to come to me when you are called, in the name of the Father + and the Son + and of the Holy Spirit + Amen]