Shadow Manse is Orfeo's underwater home. It is an Ostrokon to mer magic.
Shadow Manse is brooding and remote , an immense, sprawling structure. It has a conservatory with a pair of massive doors. Blue waterfire burned in the tall fireplace at the far end of the room. High-backed chairs made from the gnarled roots of mangrove trees flanked it. Lava bubbled in sconces on the walls. A gilt mirror stood in a corner. A massive dome of faceted amethyst capped the conservatory, casting a purple-hued light over the room. The room was lined with shelves that stretched all the way from the floor to the bottom of the amethyst dome, and every inch of space was taken by shells. Every type of shell she’d ever seen, and many she hadn’t, were on display: conchs, turitellas, whelks, nautiluses, urchins, ceriths, augurs, murexes, tritons. Some were shiny and new, others cracked with age. Long-legged spider crabs scuttled over the shelves, cleaning away silt and debris. Each shell was labeled with the name of a songspell. There were the basic spells of invisibility, camouflage, and illusion; spells to control water, wind, and light; and spells Astrid had only heard of that allowed the caster to create dragons from silt, monsters from rock, or reanimate the dead. A large desk sits in the middle of the room and from a drawer took out the most beautiful piece of jewelry Astrid had ever seen. It was a bib necklace made of row after row of small, perfect white pearls.