Hi, just started playing this pack. I've got a few sequence breakers to report:
First, a baby zombie riding a chicken spawned in my world pretty early on, long before I got to the point of getting chickens legitimately. After I killed the baby zombie, the chicken remained alive. I have no idea which mod adds baby zombies riding chickens, probably EnderZoo.
Second, I found a few dungeons with dungeon chests pretty early on. Those chests contained lots of essence from magical crops. Not really enough to do anything with, but if I scourged the earth for more dungeons, I could probably get enough essence to bypass a lot of the quests.
Otherwise, a pretty good pack so far. I hope breeding things won't be too bothersome.
Now if you'll excuse my, I've got a chicken to fence in.