Triazyze | The Binding of Isaac: Afterbirth - Invincibility OST @Yze3 | Uploaded 8 years ago | Updated 4 hours ago
That's what you hear when My Little Unicorn/The Gamekid/Taurus is activated.
You can also hear this if you use the seed PRESS T0

Time Stamp:

1 - ReGenesis (Afterbirth Title) - 0:00
2 - Fundamentum (Burning Basement) - 0:47
3 - Kave Diluvii (Flooded Caves) - 2:12
4 - Pulso Profundum (Dank Dephts) - 3:34
5 - Cicatrix (Scarred Womb) - 5:05
6 - Cerebrum Dispersio (Alt Boss Theme) - 6:09
7 - Nativitate (Blue Womb) - 7:34
8 - Morituros (The Hush) - 8:48
9 - Chorus Mortis (Ultra Greed) - 10:11

The game is made by Nicalis, and the OST is made by Ridiculon.