Warpstone Flux Rating: ⭐️⭐️⭐️⭐️4/5 stars. There's some really good lore / background here and new rules. But unless you're playing Sons of Horus or Imperial Fists you may well be thinking about skipping this as a purchase?In our very detailed reviews of the second edition of Horus Heresy, we now turn to one of the subsequent books published: The Siege of Cthonia. If players recall the