It must be these three names. There is likely an association of chastity with Cassandra, dogma with Sophia, and valour with Elysia, but these are very loose abstract relationships where the traits are weakly correlated. Cassandra may have dark and/or fantasy technological powers. There is also a likely father figure that goes by a name like Master, and may even be some form of god. The story could be in any language or culture too. There is likely to be a place called the void or the abyss, and another called the compound or similar. There may also be a cabin in the woods. It likely involves some form of Puritan like cultural element. Late 19th century cultural norms and clothing are also likely.