Eva's Knight Lionel Hunter:
The Fafurion Temple is on the south of Heine and across the sea from the Innadril Castle.
Many followers of Fafurion gathered there before he disappeared. The place was named the Fafurion Temple at that time.
Many followers wanted to visit the Fafurion Temple, so there were various routes to get there. However, they all disappeared when the temple sunk in the sea.

"Is there any other route to get there?"