Occult-sounding names are definitely to be preferred. I personally like combination words, so I prefer one-word names, and built a name based on that notion- though I agree that both Cruor and Phasmatis sound exotic and mystical, and could do nicely as name roots if put together properly.
I went into some dictionaries of Latin and Greek roots out of curiosity myself, and came up with a name based off of the "Blood God" title for that Blade creature- Erythreon. Erythro is a Greek root for red, often used in scientific jargon for blood-related things; theos is the Greek root for god, which I converted to theon because it "sounds" better to my mental ear when combined with the first root. The root prefix hem- and suffix -emia actually mean blood, but what sort of word could we combine with them to make a cool-sounding name that doesn't also sound like, say, a disease? Then again, given what the being is, maybe we actually want it to sound like a disease, but that probably won't seem very mystical or occultish.
I went into some dictionaries of Latin and Greek roots out of curiosity myself, and came up with a name based off of the "Blood God" title for that Blade creature- Erythreon. Erythro is a Greek root for red, often used in scientific jargon for blood-related things; theos is the Greek root for god, which I converted to theon because it "sounds" better to my mental ear when combined with the first root. The root prefix hem- and suffix -emia actually mean blood, but what sort of word could we combine with them to make a cool-sounding name that doesn't also sound like, say, a disease? Then again, given what the being is, maybe we actually want it to sound like a disease, but that probably won't seem very mystical or occultish.