Would it be at all possible to make it so more mobs spawned throughout the pack? several quests require mob drop specific items, and even with mods that could spawn them, it's a struggle to even find a signle one of a lot of mobs. In test SP I saw so many mobs I didn't even know were in the pack because they were never seen on server, or for the blazing juggernaut kill quest I'd wait a long time for one to spawn but no luck and it's making some quests really difficult to actually complete or mob specific items to be obtained.
For blazing juggernaut, there is a spawner in the nether at X=188, Z=343, Y=61. But I saw the same thing when I loaded single player to test something. So many mobs that I had no idea were in the pack! I would like to see the mob spawn rate in the farm worlds increased a bit, or at least weighted more to non-vanilla mobs.
undertakers do tend to spawn the most. But hats aren't the issue though it's not getting enough of all the mobs that we should be getting, on the server we see only half if we're lucky. besides the juggernaut (which thank you kaze for the coords) theres other mobs that are hard to find like whatever drops foul bristle from undead rising or a yeti as another example.
This seems to be a general issue with 1.12 modpacks which add a lot of different mobs. Sevtech does have the same issue.
Single player the mob count is ridiculous if it was about half of what it was it would be the perfect multiplayer solution