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The Sanctum of the Sages is an old tidesage study run by Yvia Wavebound, who is also available as a portal trainer. It is the portal room of Boralus Harbor, located in Boralus, capital of Kul Tiras, and most of its portals easily unlockable after completing of the beginning Kul Tiras quests.
It is described by Taelia Fordragon as an old study where the Tidesages conducted their ancient rituals, but was abandoned when they retreated to their monasteries in Stormsong Valley. Several 7th Legion Magus appeared here to open portals for the Alliance shortly afterwards.