The shrine is very small, it looks like an iron hut (To me). You must step at the white circular tile and rotate your camera, look for non-mist illusion. Eventually it'll lead you to Gigas Gate, summon Belias and you're at Giruvegan. The monster there gives yummy EXP, be sure to eat them.
The boss is Rafflesia.
For the Henne Mines, (SPOILER)If you enter from Feywood, it'll lead you to Zodiac.
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