(https://vignette.wikia.nocookie.net/forgottenrealms/images/f/f5/Tarrasque.jpg/revision/latest/scale-to-width-down/350?cb=20070925223708)
I have seen some Dragons but not all the other fantasy monsters from Dungeons and Dragons (http://dnd.wizards.com/). Are there existing mod that have them? If not there should be one!
Epic Omega is a fantasy mod in progress, may fit in there well. Possibly. Not sure how much of their lore is already set in stone...
https://ludeon.com/forums/index.php?topic=31476.0