1 more quick question, is the bovine essence the current end of the story missions? Can't seem to find anything else.
For the new cave biome? It spawns as a random chance when you go into the exploration outer jungle area.
It has a chance to spawn draugirls, but there is a current bug in the area that if you go into the water area, you will become soft locked, so avoid it.
If you want more help on the story and quests, you're better off checking the Discord, as people post about help and guides on there.