Eva's Knight Lionel Hunter:
Yes, despite all risks, the Ivory Tower decided to send a gatekeeper. Because the temple is really dangerous, you can get there only through Gatekeeper Flauen in Heine.
Ask Gatekeeper Flauen to teleport you to the Fafurion Temple. To return to Heine, you should find Frederick; he was sent to the temple to support the advance unit.
If you find him, Frederick will tell you what to do.