I've only recently joined the Maelstrom, but already I'm stationed within a stone's throw of an imperial castrum. I believe this is called "drawing the short straw"...

(After completing Primal Awakening)

Though I don't doubt your abilities, none can say what dangers lurk beneath Castrum Occidens. For my lady's sake as well as your own, please spare neither preparation nor caution. Pray choose your companions well.

• Ask about the Binding Coil of Bahamut.

According to Lady Alisaie, a labyrinthine cavern extends for malms and malms beneath Castrum Occidens. "The Binding Coil," I sometimes hear her call it, though I cannot rightly tell you why.