When I was playing about half an hour ago, a health bar appeared on my screen and it had the name Blizz Ard. So I did a bit of questioning and found out that this Blizz Ard is a mini boss. And about 15-20 minutes afterwards, I came across a Super Turkey health bar. That got me thinking: "How many mini bosses are there on this server?" Since I'm new to this server, if I could get an answer to my question, even if it's just a guess, then I'd be happy.
From what I can remember, Momentum (Giant Zombie) Marlix (Flying Skeleton) Blizzard (Snowman) Super Turkey (Fast Chicken) Edit: Found more info https://empireminecraft.com/wiki/custom-mobs/