Blaze Release: Kagutsuchi

Named after the Shinto God of Fire, this technique shapes the inextinguishable black flames of Amaterasu into spikes that both shield the user as well as burn and pierce the opponent if they touch them. This technique seems to be controlled by Sasuke's right eye, as he was covering his left when using it.

Influence
Kagutsuchi is the God of Fire in Shinto and the one who brought death into the world by burning his mother Izanami to death as she gave birth to him. This made his father Izanagi kill him with the Totsuka sword.