your analysis on the black egg was super cool!! and it got me thinking, what are your thoughts on the role of the ancient bug corpse that houses the egg in all of this?? so, why PK chose it specifically, and if it somehow was a good place to make an elaborate void construct powered by seals in, etc
In universe, there's no real way to know
Maybe it was the only unoccupied space large enough to house the egg
Maybe the egg or the chamber at its core was already there, like the weird chamber where the shade spawns in the colosseum of fools, and it was later repurposed for the seal
Maybe the location has relation with how they sealed Radiance in the first place
But the location is rather unassuming, being pretty much a commonly transited route not that close to crystal peak or in some sort of center
Not really helpful to dispell the mystery, but I personally like to think/headcanon that the corpse was that of an ancient caterpillar (Bardoon shows us caterpillars can get really large in this world). Some of the soul totems seem to depict caterpillars as well, famous example being the dragonhead caterpillar.
The horns all over the temple makes me think strongly of this one (I search it up under the name of dragon caterpillar (not to confuse with dragonhead) but honestly I'm not sure if that's the actual name)
