The Locket

The Locket (JP: ロケット) is an armor found in Asgore's Home. It is a heart-shaped locket,^[1] and is the Heart Locket's Genocide Route counterpart. Its offensive counterpart is the Real Knife. It is the Genocide Route armor item associated with the fallen human.

Location

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Trivia

Despite being the toughest armor in the game, The Locket never sees any real use; it is found right at the end of the Genocide Route, and Sans, the route's final enemy, always deals one damage.
The Locket is the only item in Undertale to include "The" at the start of its name. In the Japanese translation, this emphasis is maintained by changing the line "You got The Locket." to, approximately, "Took back the locket."^[2]

References

↑ (There's a heart-shaped locket inside the box.) — Narration, Asgore's Home
↑ "Fortunately, the team recognized the importance of the word “The” in this line. So, to preserve Toby’s intention, the translator replaced the verb “got” with “took back”. Thus, the Japanese version of this line became:
Took back [a/the] locket."
— Clyde Mandelin, Legends of Localization Book 3: UNDERTALE, pg. 229

[1] (There's a heart-shaped locket inside the box.) — Narration, Asgore's Home

[2] "Fortunately, the team recognized the importance of the word “The” in this line. So, to preserve Toby’s intention, the translator replaced the verb “got” with “took back”. Thus, the Japanese version of this line became:
Took back [a/the] locket."
— Clyde Mandelin, Legends of Localization Book 3: UNDERTALE, pg. 229

[1]

[2]