Post-AncientFuelweaver boss and new shadow weapon idea

[Grand Admiral]

If you're progressing normally and are about to fight the Ancient fuelweaver you've killed the Ancient Guardian and cleared the ruins out of thulecite, after defeating Ancient Fuelweaver you start to unleash Them, my idea is to make a shadow mutated Ancient Guardian like the lunar mutated giants falling apart till you destroy his body and fight pure horror fuel with 1 or 2 new phases, he wouldn't be burnable though.

New weapon idea: in the shadowpinch crafting station a craftable spear with fencing sword animation and bigger fange.

I don't fully understand why Klei has a problem adding new shadow content, like in ONE lunar update we got 3 strong gears and 3 bosses alongside with the lunar hail, maybe because shadow is harder to make aggresive but balanced? Or maybe because it's hard to keep shadow's atmosphere? Feel free to explain or tell me your own thought.