the wilden's mobs don't appear to me, i'm on version 1.20.1, on a server with some firends, but in a solo world they don't appear to me either.
#the mobs don't appear to me
steep halo
sterile sable
1.20 we switched them from standard hostile spawning to only appearing in structures called wilden dens. Too many early game players got murdered.
They look like podzol and wood circular mounds
mossy obsidian
Also If you have ars additions they will also spawn in arcane libraries
Finally you can summon them with the ritual of summon wilden
sterile sable
And don't forget there are two recipes for that tablet. So it's not a chicken vs egg thing, one uses vanilla items
mossy obsidian
The other uses drops