The makeshift pendulum in use.

Hellblazer #183

Unknown spell.

Hellblazer #183

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Update #1 with thanks to thehallofjudgment:

“Gun ghiomh, gun gheimh roimh neach fo’n ghrein,” means “Without fear, without terror of any one under the sun,” and comes from a verse called “Blessing of the Kindling”

Constantine using a spell to unlock a gate.

Hellblazer #183

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Update #1 from graycloak:

Sum amico huic domui  •  I am a friend to this house

I hope my dime-store Latin is at least somewhat accurate  The rest of it feels a little cobbled together:

• Ancor, Anacor … these are two angels normally seen as part of a triad (at the very least. Sometimes even more). What happened to Anelos/Anylos?
• Candones helosi … this is another angelic name/title (i think), and it comes from the Ars Notoria’s Oration of the Physical Art, which is about divining “perfect knowledge of any disease.” I have never seen this used outside this context, so I would love any references to other uses people might be able to share!
• et vos eleutis phugori … I have no idea. I mean, et vos translates to “and you..” so, I assume eleutis phugori is the name of a spiritual entity, but can’t find any other references to it outside this comic (or any others inside the comic, for that matter).

Overall, this appears to be an invocation of 4 entities (angelic or otherwise) to either authenticate/vouch-for the claims of his incantation or to stand as judges of his supplication. That is, assuming “eleutis phugori” is another angelic/ethereal entity. As I said above, I haven’t been able to find references to it anywhere.

Constantine (or may be someone else) casting a spell.

Hellblazer #183.