Acharn

Acharn is the primary stealth weapon in Middle-earth: Shadow of Mordor. The hilt-piece of Talion's son Dirhael's shattered sword, the broken blade is still a lethal implement, re-named Acharn, meaning "vengeance" in Sindarin, and likewise re-purposed as a silent implement to enact its namesake upon Sauron's armies.

After Talion becomes a Ringwraith, the blade gets reforged into sinister-looking, knife with a barbed edge.

Trivia

 * Acharn, before being reforged, was previously the shattered sword of Talion's son, Dirhael.
 * Talion gave this sword to Dirhael, having it custom made by a blacksmith.
 * Acharn means Vengeance in the Elven language of Sindarin.
 * Like the sword, Urfael, the five "runes" engraved on Acharn's cross-hilt spell out its name in Elvish Tengwar using Full Sindarin Mode. This matches the origin of its Sindarin name.
 * Acharne (the alleged derivative for the Elvish word) is French for "perseverance".
 * After Talion’s death at the end of Shadow of War, he drops Acharn to the ground. Acharn lands blade-first and sticks out of the dirt. As Talion wanders off, a flower grows from where Acharn lands. The flower bears a strong resemblance to Nephredil, the flower Talion gave to Loreth at the beginning of Shadow of Mordor.