Longinus

The Longinus (ロンギヌス 神滅具, Ronginusu ) also known as Tools that Destroy God are the fourteen original top-tier Sacred Gears with enough power to kill Gods, as well as five additional Sacred Gears that evolved to the same level.

Summary
This class of Sacred Gears is specifically named after the True Longinus, the first and originally thought to be the most powerful until the discovery of Eternal Damnation, and unlike other Sacred Gears that have more than one of the same type, the Longinus are utterly and completely unique. Originally it was thought that only one of each Longinus may exist at a time but this was proven false as Thea Corentine became popular after it was discovered she also wielded the Longinus known as Zenith Tempest. Azazel has stated that all Longinus is just a combination of one ability with another. Essentially, they combine powerful abilities that aren’t supposed to be combined. All of the Longinus are considered the strongest Sacred Gears in their respective categories such as Dimension Lost being considered the ultimate barrier-type Sacred Gear or Annihilation Maker being considered the ultimate creation-type Sacred Gear.

According to Azazel, the Longinus are highly scalable and expandable Sacred Gears, especially after attaining the Balance Breaker, their power would significantly increase, and the abilities that they could manipulate also increased. Azazel had hypothesized said that Longinus absorbs their wielder’s abilities and creativity, and then becomes a vessel for their realization.

Eleven out of fourteen of the original Longinus have appeared in the series. In addition, 5 new Longinus were born after the Evil Dragon War due to the abnormality on the Sacred Gear system, and the Sacred Gears' ability for growth and change.

Original Longinus
The first 14 Original Longinus made by the God from the Bible.

New Longinus
The new Longinus consisting from the evolution of a Sacred Gear (Aeon Balor) and others currently of unknown origin.

Trivia

 * Four of the fourteen (currently nineteen) Longinus contain powerful creatures, three of which have had roles in the storyline.
 * Among the Longinus, the True Longinus, and Canis Lykaon were used to either wound or kill a god prior to being made into Sacred Gears.
 * The Longinus Canis Lykaon is a reference to the scientific name of the Eastern Timber Wolf (Canis lycaon), a wolf that lives in Eastern Canada. It may also be a reference to Lycaon, the man that was turned into a wolf by Zeus as punishment for feeding him Nyctimus, Lycaon's own son. The form and the backstory in Slash/Dog, however, is similar to the Chinese Tiangou.
 * It is revealed in the spinoff Slashdog that Canis Lycaon contains a composite of two beings: Lycaon as mentioned above, together with the Ama no Ohabari, one of the Totsuka no Tsurugi in Japanese mythology. Ama no Ohabari was used by Izanagi to kill his own son Kagu-Tsuchi (aka Hinokagutsuchi), whose birth burned his mother Izanami to death.
 * Out of the fourteen (now nineteen) Longinus, five of them are known as the Holy Relics, they are: the Holy Spear - True Longinus, the Holy Grail - Sephiroth Graal, the Holy Cross - Incinerate Anthem, the Holy Nail - Alpheeca Tyrant, and the Holy Amorphous - Eternal Damnation.
 * During the "Kyoto Incident" in Volume 9, the original Sun Wukong tells Georg that he needs to talk with his Longinus to better grasp its abilities. This suggests that the remaining Longinus that don't have a creature sealed inside them, instead have some other form of consciousness.
 * The name Longinus is based upon the legendary and mystical figure of Christian mythology. Longinus, according to multiple Christian communions, is said to have been the soldier who pierced Jesus' side with a lance.
 * Four of the five High-Tier original Longinus users have Sub-species Balance Breakers.
 * Eleven of the newly discovered Longinus are not apart of the DxD world but are originated in the MxM world.