I think that the FSC should have more enemies that fit within its theme, like more fiends and undeads rather than wolvers, jellies and puppies. I know that some of those enemies are there to make things easier for us and then they are replaced with stronger variations in the shadows lair (i.e red rovers replaced by fire howlitzers)
Slimes should be replaced by pepperKats.
Beast should be replaced by Devilites and replace some zombies in some rooms.
In the 1st spike room at depth 26 they should add some gorgos
In the 27th depth they should replace those tier 1 puppies with tier 3 (I dont even know what they are doing there)
In the shadows lair they should add pepperkat as well and add a chance that in those pepperkats may randomly spawn a black kat.
It's more like a stetyc issue, if the fsc is about undead and a cursed kingdom they should monster that relate to that somehow.
Kats are cursed creatures, but they're under a different curse. So they have nothing to do with Vanaduky.
Trojans are there because they are literally ancient Almirian bots.
Howlitzers are undead puppies, and they only appear where Kats do, so I'm gonna go out on a limb here and theorize that they're also under the same curse as the Kats.
Devilites are workers for the underworld. Vanaduky is a guy who traps souls in his citadel. If anything, they would be against each other.
Also, OOO is working on a new tier 3 boss. So we'll be seeing different places to grind at some point.