This dual mix combines Undertale's soundtrack "Battle Against A True Hero" with Ferdk's metal cover.

Music source:

Battle Against A True Hero OST - https://www.youtube.com/watch?v=aWBtpBwzzdM

Metal Cover by Ferdk - https://www.youtube.com/watch?v=LlJ-u9ZDo_Q

Picture source:

Undyne the Undying gif by Alpha Gamboa - https://twitter.com/blackbookalpha/status/647976451937951744

Youtube version - https://www.youtube.com/watch?v=OcgIYVfybLg

You can buy the game and/or soundtrack here:
http://undertale.com/
http://store.steampowered.com/app/391540
http://tobyfox.bandcamp.com/

Also check out Toby Fox's Twitter and Tumblr for fan-artwork and overall good humour:
https://twitter.com/undertale
https://twitter.com/fwugradiation
http://undertale.tumblr.com/

Undertale Battle Against A True Hero Dual Mix

You can find Dual Mixes mashing videogame soundtracks with their respective remixes on my profile.

For now I'll mainly focus on uploading my Undertale Dual Mixes here. I did do mashups of other games' soundtracks, for example Splatoon, but unfortunately I lost the majority of them due to a motherboard crash.
Also I'm not particulary interested in Nintendo kicking my butt twice.

Undertale Battle Against A True Hero Dual Mix

iwannabethecollector