This papercraft is Spear of Cassius, a weapon first seen in Evangelion: 2.0 You Can (Not) Advance, wielded by Evangelion Mark.06 to stop Third Impact, from the Manga / Anime / Film series Neon Genesis Evangelion, this paper model is designed by Bill Chen from Taiwan. Because the original model doesn't include the weapon, so Bill made it to match.
Originally known only as a "spear", it posses a double-helical shaft and a defined spearhead implanted with a green gem and it is first seen at the lunar Tabgha Base in a shroud. During Near Third Impact, it is used by Evangelion Mark.06 to terminate the event and EVA-01's evolution into an energy being.
The Spear is colored red in Evangelion 2.0/2.22 and promotional materials for the film; however, in a promotional illustration for Evangelion 3.0, along with an Unit-06 action figure, it is colored black or dark gray instead. The reason for this discrepancy is currently unknown.
In Evangelion: 3.0 Kaworu and Shinji head down into terminal dogma to retrieve the Spear of Cassius along with the Spear of Longinus from Lilith's corpse. However, what they found were two Spears of Longinus and no Cassius. [Source: wikia]
You may download this papercraft template here: Neon Genesis Evangelion - Spear of Cassius Free Papercraft Download