john-constantines-spells:

Constantine 1×03: The Devil’s Vinyl.

Exorcism spell.

“Exorcizamus te, omnis immundus spiritus, omnis satanic potestas, omnis infernalis adversarii, in nomine et virtute Domini (unidentified word/s)”

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Update #1 with thanks to nonestasylum:

Had some help from nonestasylum – ”Exorcizamus te, omnis immundus spiritus, omnis satanic potestas, omnis infernalis adversarii, in nomine et virtute Domini/Domine…”

Update #2 with some help from Super-wiki :

“Exorcizamus te, omnis immundus spiritus”
We exorcise you, every impure spirit

“ omnis satanic potestas, omnis infernalis adversarii”
every satanic power, every incursion of the infernal adversary

“in nomine et virtute Domini/Domine”
in the name and valor of The Lord(’s Prayer)

I Googled up the individual meanings of each of the Latin words (that wasn’t included in the translations in the Super-wiki page), and put them together to translate the last sentence.

Constantine 1×07: Blessed are the Damned.

The Chi Rho monogram/symbol that appeared during John’s angel summoning spell.

Update #1 from Catholic.com:

You are speaking of the chi-rho monogram. Though the two letters look like P and X in the English alphabet, they are actually chi (looks like X) and rho (looks like P) from the Greek alphabet. They also happen to be the first two letters of “Christ” in Greek (Christos). Hence the chi-rho monogram is used as a symbol of Christ, Christianity, and Christians.

Update 2 from Wikipedia: