Lucky Phoenix Nest
The Lucky Phoenix Nest is an artifact created by Fa Nu based of the legendary metal orichalcum. Orichalcum is a metal mentioned in several ancient writings, most notably the story of Atlantis as recounted in the Critias dialogue, recorded by Plato. According to Critias, orichalcum was considered second only to gold in value, and was found and mined in many parts of Atlantis in ancient times. By the time of Critias, however, it was known only by name.
Orichalcum is a specially made alchemical combination of gold and silver that forms a type of electrum that is bonded into an atomic matrix that is much stronger than any other known metal. It absorbs magical energies and acts like a lightning rod, canceling out magical effects...and it is said that even Gods can be affected by its merest contact.
Fa Nu used her mastery of metal-elemental-qi to invert Mousse’s hidden weapons technique by imbuing his ki into the artifact during the forging process making spirit of the weapon is both a reflection of a Mousse's soul and power, and a sentient being unto itself.
T-Ryo is advancing in his use of earth-qi, Ranma is way ahead of X-Ryo in his use of elemental (wind) harnessing it for HSH variants, as a deflection tool and even to increase his speed. Mousse has speculated that he can make use of, and you can see some of that in the inverted- he used to drain Raven.
Kichi Housu is considered a Hidden Weapons Forbidden Skill, because Hidden Weaponry involves the selective manipulation of your chi. Using this chi you can create pockets of space just below the fabric of our reality. Instead of selective manipulation of chi Kichi Housu projects the effect throughout Mousse’s entire aura. Because of this any energy is instantly vaporized on contact with Mousse’s aura and absorbed directly into his reserves.
Lucky Phoenix Nest allows Mousse to negate all ki, psionics, and magic used against him by absorbing the origin of their power life force similar to orichalcum. This technique hasn’t been perfected yet so it is possible that ki of sufficient density or tainted ki to overcome it, albeit with difficulty.