You give Agent of the Arcanum Black Luster Pearl.
Agent of the Arcanum tells you, "I've seen a number of pearls in my days... You know we exchange Niffis Pearls for writs correct? ... Anyway, I have seen a number of pearls before, but this is obviously not from any niffis I've seen."
Agent of the Arcanum tells you, "Look at how dark this pearl is, it seems to eat the very light around it. This is a truly rare find, some ancient Empyrean decoration no doubt, but I can't imagine it would be very different from the niffis pearls we know of."
Agent of the Arcanum tells you, "I'll give you a special deal on this pearl, since it is obviously of a different quality than your common niffis pearls."
Agent of the Arcanum gives you 2 Writs of Refuge.
Agent of the Arcanum gives you Golden Gromnie.
Agent of the Arcanum gives you Golden Gromnie.