Undertale Ost: 081 - An Ending -

"An Ending" (Track 081) is the musical centerpiece of Undertale’s Neutral Route, serving as the somber backdrop to the final phone calls where Sans details the consequences of the player's choices. It is widely praised for its emotional weight and its ability to reflect the "reactive" nature of the game’s narrative. The Emotional Resonance of "An Ending"

"An Ending" is a slowed-down, extended version of the "Ruins" leitmotif. This choice creates a sense of cyclical return; the journey ends where it began, but the melody is now heavy with the weight of the journey. Undertale OST: 081 - An Ending

Many players argue that the Neutral endings are the most poignant because they feel the most personal and "specifically tailored" to how one actually played the game. "An Ending" (Track 081) is the musical centerpiece

“I'd forgotten how good "An Ending" was before I listened to it again while writing this part. It's so perfect for when it plays.” Reddit · r/Undertale · 2 years ago This choice creates a sense of cyclical return;

Watch how the music shifts the atmosphere during the final moments of the Neutral Route: An Ending (Final Version) - Undertale SiIvaGunner YouTube• Sep 15, 2025

Unlike the "True Pacifist" or "Genocide" endings, which offer clear closure, the Neutral Route endings—accompanied by this track—often leave the Underground in varying states of struggle, from political anarchy to characters mourning lost friends.

The song's power lies in its bittersweet tone—a mix of relief that the player escaped the Underground and guilt over the state in which they left it. It reinforces the game's message that every action has lasting consequences.