General

I found it, I had the same problem. You go to East Pantheon: East Pantheon Forest where the Kaloongs are and right smack in the middle of the map next to the directional pole is where you will find a portal (glowing gold). You enter it and you are there, but you have to keep moving right into the portals.

I don't see why can't they make a navigation for it. o.o

You're pretty much going to have to look around for it yourself.

That's what I had to do. I find Pantheon confusing, map-wise </3