I'm working on a map right now (of course) and I have redone the nether for it (nothing beautiful) but of course this leave the only fortress to be hand built where I chose it. I assume then that wither skeletons WILL NOT spawn there? Or do the coding for wither skeletons have it so they spawn in the nether anywhere as long as there is netherbrick? How does the skeleton spawning work? Should I just have hidden spawners to spawn them?