So, the mystery script here is Claw-Speak, from the Exalted First Edition RPG; it's the written language of the Lunar Exalted, who are badass shapeshifter types.
It's a syllabary with the vowel variants expressed by the orientation of the glyph poking off from the central line.
It's neat, and it's part of what got me reading about Ogham, way back in the day.