Don't know if a t this point you have to go north out of the Rillian Camp to the Rillian Wasted Hills. To launch the Global War you gotta talk to Holland (the guy below Waltz). He'll ask you if you're ready. Equip everybody before talking to him!
I can't find a save file where Holland says what you mentioned. I'm not sure which beasts you mean. You said you've beaten the X-Elven God, so the fortress must be under control now. After that you were reunited with the others. In my save file I now left the fort north to go back to the Ultai and bring the crystals. Have you done this?
Like DS asked - what does your quest book say?
Or if you want to email me your save file and I'll try to find out where you are.