-
The books of sorrow have stated that under hive onslaught countless races have been brought to extinction. The Ammonite, Qugu, Dakaua, Ecumene, Taishibethi, Harmony (and the ahamkara). We also know the hive nearly brought the Eliksni to extinction and have done battle with the cabal in the past.
-
Among the Guardians? No, none that we know of. Maybe some Orders like the First Pillars died in the Great Disaster, but I don’t know. But the Hive (sometimes with Taken help) have exterminated countless species.