Memory wipe (and wipe-reversal) spell, and the Tri-form meaning.

Hellblazer #222

Hellblazer #220

The Praexis.

Hellblazer #217

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John Constantine (from the same issue):
“Praexis are sort of bad-luck spirits. Lower than filth, they’re carrion-eaters, shape-shifters. When any great catastrophe happens, they gather. Catching scraps of souls. Feeding on them. They’re a sign trouble’s coming. Big trouble.”

Reversal sigil and spell.

Hellblazer #216

Spell to make people do what you want, and the price of that power.

Hellblazer #216

Constantine having a conversation with a cab driver about the Voodoo item in his cab.

Hellblazer #214

Information about Maitre Carrefour from Wikipedia:
“Kalfu (also spelled Kalfou or Carrefour; lit. crossroads) is one of the Petwo aspects of the spirit Papa Legba. He is syncretized with Satan.

As his name indicates, he also controls the crossroads and has the power to grant or deny access to all other Loa, or spirits, and he allows the "crossing” of bad luck, deliberate destruction, misfortune, and injustices.“

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Information about the Boneyard Baron (Baron Samedi) from Wikipedia:
"Baron Samedi (French: Baron Saturday, also written Baron Samdi, Bawon Samedi, or Bawon Sanmdi) is one of the Loa of Haitian Vodou. Samedi is a Loa of the dead, along with Baron’s numerous other incarnations Baron Cimetière, Baron La Croix, and Baron Kriminel. He is syncretized with Saint Martin de Porres.

He is the head of the Guédé family of Loa. His wife is the Loa Maman Brigitte.”

The Abano Ritual.

Hellblazer #190