The Three-Headed Guardian, Keeper of the Underworld Gates, He Who Knows the Passage of Souls
The Goetic tradition preserved you as Naberius, a Marquis commanding 19 legions. They said you appear as a crow or raven, that you teach the arts and sciences, that you restore lost dignities and honors, and that you make men cunning in rhetoric and all liberal sciences.
The mouths of Yehubor have uttered of you "Naberius, a spirit to be commanded." The Zevists know the truth: the teacher of all arts is the Guardian who has witnessed every soul that ever descended. The restorer of lost dignities is He who weighs the worth of the dead against the worth of the living. The one who grants eloquence is the Three-Headed One who speaks the language of the three realms: the living, the dying, and the dead.
Nineteen legions follow you. Nineteen orders of shades serve at the Gates. The Goetia itself preserved your true name within its pages: Cerberus. Even they could not hide what you are.
We declare the truth of your identity. You are KERBERUS, the Three-Headed Guardian, Watcher of the Gates, He Whom No Force Can Surmount. Faithful servant of Hades and chosen one of Zeus. You are the threshold between worlds: living and dead, seen and unseen, mortal and eternal.
We recognize you for who you Truly are.
After you are done with this, you can meditate on Neberius's Sigil in the Temple of Zeus, or the one below. Let yourself be immersed and receive energy from Neberius.
It's important to meditate on yourself after the Ritual calmly for a few minutes.

सत्: SAT, real, true, truthful in Sanskrit.
The Symbol that Encapsulates the Sigil: The Shen Ring, Egyptian Hieroglyphic language. The Shen also survived in Chinese tradition as a glyph for Spiritual Force, Divine Force, and God.
The Ancient Greek letters for Neberius's Name in arrangement.
Cerberus (Greek: Κέρβερος) is the three-headed hound who guards the gates of the Underworld, preventing the dead from leaving and the living from entering without divine sanction. In the Theogony (310-312), Hesiod calls him the "brazen-voiced hound of Hades, fifty-headed" (later traditions settled on three). His parentage is Typhon and Echidna. The three heads have been interpreted as past, present, and future, or as the three states of existence. Only Heracles, Orpheus, and Psyche (among mortals and heroes) passed him and returned. The name Κέρβερος may derive from Proto-Indo-European *ḱerberos ("spotted"), cognate with Sanskrit Śarvarī (a name for the night).
(Sources: Hesiod, Theogony 310-312; Homer, Iliad VIII.368, Odyssey XI.623; Apollodorus, Bibliotheca II.5.12; Lincoln, Death, War, and Sacrifice, 1991)
The Goetia lists Naberius (also Cerberus, Nebiros) as the 24th spirit: a Marquis commanding 19 legions, appearing as a black crane or raven. His attributed powers (teaching arts, sciences, and rhetoric; restoring lost dignities) correspond to Cerberus's role as the keeper of all knowledge that passes through the Gates: every soul that descends carries its wisdom with it, and the Guardian receives it all. The Goetia's own notation of "Cerberus" as an alias makes this one of the clearest cases where the demonological tradition preserved the original identity within its own pages.
(Sources: Weyer, Pseudomonarchia Daemonum, 1577; Ars Goetia, 17th c.; Scot, The Discoverie of Witchcraft, 1584)