Slave Red (深紅の魔眼(スレイブレッド) Sureibu Reddo, Deep Crimson Demon Eyes) is a magic spell used by Rachel Alucard and Raquel Alucard. It allows the user to control someone to their own whims, however it can only be used on a person once.

Rachel first demonstrates the ability in BlazBlue: Chronophantasma when she attempts to control Amane Nishiki, however, for some reason, Amane is completely immune to the effect and comments that it will fail to work on him, much to Rachel’s astonishment.

Raquel uses the ability on Haruka Hayami in BlazBlue: Bloodedge Experience — Part 1 when she needs a way to stay close to Naoto Kurogane. Raquel fools Haruka into believing that Naoto is her own cousin so that Haruka may not become suspicious about the duo’s relationship. She used it again on an adult store attendant so she could gain information on Kana Kirishima.