Nth metal (also called ninth metal) is a metal found in the DC Dark multiverse.
It is native to Thanagar, the home planet of Katar Hol, Shayera Hol, and Shayera Thal. Among the unusual properties of Nth metal is the ability to negate gravity, allowing a person wearing an object, such as a belt, made of Nth Metal to fly. In addition, Nth metal also protects the wearer from the elements and speeds the healing of wounds, increases their strength, and protects them from extremes in temperature.
It has many other properties that have yet to be revealed in full. It has been implied that the apparently " magical" abilities of the Thanagarian supervillain, Onimar Synn, all stem from his unique mastery of the properties of Nth metal. These powers are augmented to a god-like level in the Rann-Thanagar war when he builds himself an artificial body made of the substance.
In ancient Egypt a Thanagarian spaceship made of Nth metal crash-landed, to be discovered by Prince Khufu and his betrothed, Chay-ara. Exposure to Nth metal forced Khufu and Chay-ara into a cycle of reincarnation. In the Twentieth Century, they were incarnated as Carter Hall and Shiera Saunders, the original Hawkman and Hawkgirl. As Hawkman and Hawkgirl, they wore Nth metal belts, made with the help of Thanagarian Paran Katar, father of Katar Hol, when he was visiting earth.
Many years later, Carter and Shiera's son, Hector Hall made a suit of armour made of Nth metal and took the name Silver Scarab as a founding member of Infinity, Inc. The suit provided him with protection from attacks, allowed him to fly and to project solar energy blasts, and let him lift great weights.
The current Hawkman and Hawkgirl continue to wear Nth metal, and Deathstroke once had an Nth Metal suit in the New 52.
Members of the Legion of Super-Heroes wear Flight rings made of an alloy of Nth metal called Valorium.
In some other publishing's Nth Metal has the capacity to destabilize magic and all things wrought of it, it's mainly utilized by Thanagarians in JLU continuity but has been used by both Batman and Green Arrow against they're more supernatural foes.
In recent publishing the mysterious materia is treated as semi sentient with mystical properties of its own. Retaining many of its previous effects in initial continuity, nth metal seems to have inherited effects from its animated showing as well. Katar Hol having used it too negate the intangibility of an army of evil spirits when battling Gentleman Ghost, a couple of unique attributes the alloy has is creating and sharing a symbiotic link with whomever it bonds itself too.
Not only healing and regenerating destroyed anatomy but restoring long thought lost attributes of the wielder in its unadulterated form. In the case of Hol, the metal regrew his wings; a trait lost to all Thanagarians due to a great viral epidemic within their later generations. It also has an Anti-Healing Factor to it, in that it can prevent regenerative and/or replicative capacities from procreating new tissue.
The metal moves and reacts whenever the host is in danger creating and reinforcing protective liquid metal armor which shapes and forms into various weaponry. It also morphs itself around to protect the wearer from assaults they normally cannot parry in time, experienced users can even manipulate it in more creative ways like enhancing ones own powers and abilities or even creating ranged weaponry capable of staggering individuals as tough as Kryptonians, Daxamites and even Martians.
Nth Metal shares an attunement with the Dark Multiverse, home of Barbatos and his army of nightmares. It fuses with and alternates those who utilize its substance in order to bestow supernatural powers onto it's wielders by bending the rules of physics to do so.
Due to this unique property to channel it's dark energy, denizens of the Dark Multiverse are also vulnerable to the Ninth Metal, being one of the few things that can hurt Barbatos, The Dark Knights, and the vast cadre of horrors waiting out in the dark dimensions below creation. Due to their odd natural state of physics making them immune to whatever effects inflicted upon them by the positive multiverse and its denizens.