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Undyne the undying soundtrack

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A short clip of Battle Against a True Hero, Undyne the Undying's boss theme from Undertale, used for intense battles, edits and heroic gaming moments.

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About this sound

A short clip of Battle Against a True Hero, Undyne the Undying's boss theme from Undertale, used for intense battles, edits and heroic gaming moments.

This five second excerpt captures the driving energy of Battle Against a True Hero, the fast orchestral rock theme that plays during the Undyne the Undying fight. Punchy drums, urgent strings and a heroic melody surge forward without a pause, creating instant tension even out of context. Detached from the boss battle, the clip works like a musical power up, making an ordinary moment feel like a final stand. Viewers familiar with the game recognise the determination and danger immediately, while others simply hear music that refuses to back down or let the scene stay calm.

Pro tip

Drop the clip right as a character commits to an impossible challenge, letting the drums hit on the cut. Keep game audio low underneath, do not loop this short excerpt, and avoid using it under dialogue because the melody will overpower speech.

How people use it

Editors add it before a difficult boss fight attempt.
Gamers play it when making a last second comeback.
Creators use it to hype a determined anime edit.
Streamers trigger it during intense speedrun final moments.

More information

Battle Against a True Hero was composed by Toby Fox for Undertale, released in 2015. In the game it accompanies Undyne the Undying, the empowered form of Undyne encountered on the Genocide Route, where she resists the player with exceptional determination. The Undertale soundtrack became widely shared outside the game through streams, remixes, covers and fan edits, helping its boss themes stay recognisable for years. This short excerpt circulates as a reaction and hype clip because it instantly signals a serious challenge, a heroic resistance and a fight that has escalated beyond a normal encounter.

FAQ

What is the Undyne the Undying soundtrack called?

The track is titled Battle Against a True Hero and was composed by Toby Fox for Undertale. It plays during the fight against Undyne the Undying, the stronger form of Undyne faced on the Genocide Route in the game.

Who is Undyne the Undying in Undertale?

Undyne the Undying is Undyne transformed by her determination in Undertale when the player follows the Genocide Route. She becomes a much harder boss than in other routes, refusing to die and fighting to protect the underground's monsters.

How do people use this sound online?

Creators use this short excerpt as a hype and reaction sound for boss fights, comebacks and determined character edits. Its fast, heroic energy works well at a reveal or challenge moment, especially in gaming videos where viewers recognise the Undertale reference instantly.