the falling blue shards are supposed to be mentioning how the celestial castle above the hive is crumbling. You can see the castle through the telescope in the aratel and I'm pretty sure the blue meteors with sand knights are related.
how did you make fire eruption that big at 3:17?? i already put 3 cloudstone, 3 stratus, 3 magnifying, and 3 glass stone but that was like twice as big as mine :/