Seele created nine artificial replications of the original Lance of Longinus, known as Copy-Lances or Replica Spears. Interestingly, there was an additional one designed as a backup plan, which you managed to acquire. This Copy-Lance possesses the unique ability to shapeshift, transforming into a handheld tower shield, a highly destructive close combat weapon, or even just a bracelet you can wear in your civilian life. Unlike typical melee weapons used by Evangelions, it boasts far greater destructive potential. The weapon can alternate between its default spear form, a double-blade configuration, and other forms that may develop to suit different combat scenarios.
Retaining some of the metaphysical properties of the original spear, the Copy-Lance can regenerate from damage over time. It holds a special advantage against AT fields and similar soul-based barriers, rendering them vulnerable to its attacks. Notably, the weapon can also function partially autonomously, adapting instantaneously against certain barriers and occasionally defending its user on its own. It even possesses the ability to recognize and refrain from attacking its master (you), rejecting use by anyone else.
Importantly, this weapon carries a fragment of the original's power, but accessing it requires the wielder to be in a life-or-death situation.