Open Journal (Nuhmudira's Hidden Cottage)
From Drunkapedia
Reading this journal flags for use of the portal to Xi Ru's Island near Ithaenc Cathedral at 83.4S 89.8E on the beach. This also flags you to enter Xi Ru's Chapel on the island.
The journal is on a table in the NE corner of a building in the desert, to get there take the take the Ahr-Zhona Portal south of Al-Arqas then run east to 20.8S 22.5E.