The Siren

The Siren is a boss added in The Binding of Isaac: Repentance that can appear in the Mausoleum.

• The Siren originates from the Antibirth mod. Compared to the version in Repentance, two features were cut: one was a musical note projectile attack that reversed your controls, and the other was a revival mechanic that occured when The Siren charmed an extra life familiar like 1up! or Dead Cat.
• She is based off of Sirens from Greek mythology, which were dangerous creatures who lured nearby sailors with their enchanting music and singing voices.
• The Siren is the only boss that can interact with Isaac's collected items or familiars.
• The Siren's ring of tears and sinking in the ground attacks are references to the Gorgun boss from the game Enter the Gungeon. Moreover, both bosses leave behind remains that can be destroyed.
• The Siren is voiced by Carla Kihlstedt, also known to be the voice of Mom. Bosses Chapter 1 Monstro
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