Hellblaze is a dark and mysterious power connected to the Demon Clan. It allows the user to generate and control black flames that cannot be extinguished. In addition to its immensely devastating power, the flames also nullify any regenerative abilities including that of an immortal.
In battle, Hellblaze can be imbued upon weapons through an Enchant: Hellblaze「
- Kami Chigiri「
神 千斬り Kami Chigiri; literally meaning "Divine Thousand Slashes"」: A powerful attack that requires Meliodas to heighten his power and senses to the utmost limit. Black flames engulf his sword as he leaps into the air. He then performs a powerful slash that hurls the flames in a single, ruinous attack.
- Hellblaze Wave「
波状の獄炎Herubureizu Wēbu; literally meaning "Waveform Hellfire"」: Hendrickson points his sword towards the opponent and engulfs them in a wild, black inferno.
- Evil Hound「
邪悪な猟犬Ebiru Haundo」: Mael (under his Estarossa persona) creates a large dog made of dark flames that incinerates anyone in its path. It can also create a giant barrier of flames to trap its targets in.
- Hellblaze Omega「
獄炎極Herubureizu Omega」:The Original Demon fires an spider-like Hellblaze blast from his cane. 
- The only known person who was able to put out the flame was Merlin and later on Elizabeth Liones.
- Hellblaze Wave was originally called Hellblaze Scream「
獄炎の怒号Herubureizu Sukurīmu; literally "Hellfire Bellow"」 in the magazine release.
- Evil Hound was originally called Black Hound「
黒の猟犬Burakku Haundo」 in the magazine release.