Go to the entrance to the portal that will take you to the Dragon Emperor's Catacomb. Once you are there, find someone to help you. (After being teleported, auto-route to Alik, one of the people closest to the portal's exit.)

Show Quest Info

Introduction

Evna was indeed the one that rendered Emerton powerless. Through her, you learned that there is indeed a new threat afoot in the form of the Dragon Emperor. Go through the portal that will take you to the Dragon Emperor's Catacomb.
}Auto-route to the destination, complete the A New Threat quest, and then exit through the portal, which will take you to the Dragon Emperor's Catacomb.

Quest Completion

So you know of the Dragon Emperor? Good. That'll
make working together a lot easier. It's good to
have some help. I was beginning to worry that my
little group was all that was going to stand against
him.