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"red orb" - a sphere of prohibition. It looks like a red ball; you won't mistake it.
"collection for slow+curse+weakness+antiluck" - this refers to the Cursed Armor artifact, which is assembled from 4 other artifacts and grants the effect that the aforementioned 4 spells are cast on enemies at the beginning of the battle. (Hopefully, it's not necessary to explain that "art" = artifact?).
The rest seems to be already described.