The Mysti Script is an unimaginably ancient writing system of unknown provenance. The name is commonly believed to be short for “mystical”, but in fact it is named for Mysti, Sarcat XIII, prophesied to effect the cat takeover of the world as written in the First Whoskoma of the Old Cat Religion. Anyway, a full transliteration is not yet available, but it is hoped and believed that a clever linguistically minded individual will be able to decipher it one day.
All that is known of it is that it is likely to be an abugida with stacking consonants, and that it appears in abundance on these cards.