Fantasy Voyage adds a plethora of mobs, new locations and behaviors!

I won't be naming everything so explore at your leisure.

I'm not sure with what versions this works but it's good on 1.16 versions!

NEW MOBS

With new goblin-like foes called Dakanis come new allies in shining armor, knights that can wield crossbows or swords and will help you fight monsters— as long as you don't turn against them.

Many creatures lurk in the ice and snow, especially at night. One of these has an unexpected transformation, and the other can go invisible, so watch out.. "G'ka Thor'fa" - Left; Horla - Right

Misc. new monsters include a fiercer skeleton, the Baykok (center left), the Witch Mistress (right), a Nephropid (center right), and a Scryatta (left), so gear up before you go out adventuring next time.

In the Nether there's a new arachnid creature that thrives in lava, the Ignatosect!

New Counterparts to the Strays and Husks: Frozen Husks and Parcheds!

Craft your own allies: this robotic new buddy can help you ward off enemies; the Protoguardian.

First, you'll need to make a Protoguardian Shell:

With that, you can craft a Protoguardian Egg. (Also yes that is Wheatley lol)

New swampy Bog biome made of a new block "Peat"! There is a scary creature that lurks there, as well, and I haven't shown it yet.

Lots of new generated structures, but I'm honestly not sure if the structure generation broke :P

Other mobs I haven't shown yet:

Birds!
Babirusa, a mammoth-like creature
The Bogbody...

This is an old thing I made for a friend and there may be issues so be warned! And watch out for the blood moon ;)