Mowzie's Mobs adds a variety of mobs to Minecraft, each with incredible animations and unique AI.
Here's a link to the mod page: https://www.curseforge.com/minecraft/...
The mod version shown in this video is version 1.5.6 for Minecraft 1.12.2.

Timestamps:
0:00 Intro
0:56 Foliaath
2:58 Ferrous Wroughtnaut
4:41 Barakoa & Barakoana
6:18 Barako the Sun Chief
10:12 Lantern
10:41 Frostmaw
12:48 Naga
14:30 Grottol
15:47 Future of the mod

Credits:
The mod is developed by Bob Mowzie, pau101, and iLexiconn from curseforge.com.
The Replay mod was used to film parts of this video. https://www.replaymod.com

Music used:
Tales Runner OST    • 跑Online BGM音樂  夢幻糖果樂園EP3 冰涼布丁  
Sad Theme from E. V. O. Search for Eden (SNES)
"Taswell" by C418 https://c418.bandcamp.com/album/minec...

Here you can take a look at the mod's Config file if you wish https://pastebin.com/mzqerSW3