Xenoblade Chronicles/Alcamoth

There are far plenty of things to do here but the cutscenes will have to go through first. Melia will leave your team for the majority at the moment. It's revealed that she will be crowned princess with her father Sorean, brother Kallian and the woman called Lorithia. Also introducing Yumea and Tyrea who is doing what they can to eliminate Melia.

Once you can control the team after an interview with Alvis and doing the story quest on Eryth Sea, take as much time to soak up more sidequests because later on inevitably, everyone will turn into a Telethia when the time comes. Once you save the people on Eryth Sea, when you're done go back to the Imperial Palace and tell the guard that your team needs to rest.

The Setup
Melia agrees to do the task of going through High Entia Tomb to get her approval of her people. Shulk has a vision that the masked woman Tyrea would be there and a Telethia would drain Melia's life. But Yumea's band of team came and you have to battle them in order for the story to continue.

After a major cutscene involving Alvis and Kallian, if you have revealed the map completely, teleport to High Entia Tomb to rescue Melia from the danger that lies ahead.