Lance of Longinus
The Lance of Longinus is an artifact of great power, and is the only weapon that is specially designed to pierce any AT Field. It resembles a long red spear (Evangelion-sized) that forks near the middle, the two shafts first twisting around themselves to form a helix and then becoming straight. In the director's cut of episode 22, the Lance's forks twist into a spiral shape just before it strikes Arael's AT Field. The Lance also takes on a different, double-forked shape in The End of Evangelion.
The Lance was used in a "contact experiment" with Adam, which caused the Angel's awakening and the Second Impact. In episode 12, the Lance was recovered from the new "dead sea" (the remnants of Antarctica) to be used to control Lilith. The Lance was used as a last resort weapon to attack the fifteenth Angel, Arael, which was in orbit and outside the direct reach of the Evas or any other terrestrial weaponry but it ended up being lost from Nerv when, in destroying the Angel, it reached escape velocity and became lodged in lunar orbit and planted itself into the moon's surface (specifically, in Walter crater); it returned in The End of Evangelion, moments before the Third Impact. The Lance is a key piece to the process of Instrumentality. Artificial versions of the Lance are used as the primary weapon for the mass-production Evas, and also feature prominently in the Instrumentality.
According to the spin off PlayStation 2 video game Neon Genesis Evangelion 2's classified information, the Angels Adam and Lilith that originated from Seeds of Life created by a god-like ancient extraterrestrial species known as "First Ancestral Race". A Lance of Longinus was sent along by the First Ancestral Race inside of both the black and white egg that Adam and Lilith were sent by in, in order to control them if they went against their goals. The Lance of Longinus appearing in the series is the one that was paired with Adam, and recovered from Antarctica. The Lance of Longinus paired with Lilith is presumed to have been lost or destroyed when Lilith's Black Moon collided with Earth during First Impact.[3] (See "Terms from outside of the main series" for more details).
In the Rebuild of Evangelion, the classic forked lance is shown impaling Lilith in Central Dogma, just before the battle with Ramiel. Another Lance is shown in 2.0 with a bladed head. It was thrown by evangelion Mark.06, piercing Unit 01 after the credits, stopping Unit 01 transformation and Third Impact. It is currently unknown what the origin of this Lance is.
The name "Lance of Longinus" originally refers to a Christian mythological object, also called the Spear of Destiny, which is supposedly the spear that a Roman soldier (Longinus) used to pierce Jesus Christ's side after he was crucified. In the original Japanese, the weapon was referred to as the "Spear of Longinus."
Note: There is some discrepancy as to whether the proper name is "Lance of Longinus" or "Spear of Longinus", as Japanese does not differentiate "spear" or "lance," instead using an all encompassing word (枪, yari). In the manga adaptation, it is called the "Spear of Longinus."