Melascula

is a demon who is a member of the Ten Commandments, a group of elite warriors of the Demon Clan handpicked by the Demon King himself. She was sealed away along with the rest of the clan in the Coffin of Eternal Darkness until she was set free by Hendrickson.

3,000 years ago
Along with the rest of the Demon Clan, Merascylla was sealed away by the Goddess Clan after losing the Ancient War against the Four Races (Human, Fairy, Giant and Goddess Clans).

Current arc
After Hendrickson managed to remove the seal, Merascylla and the rest of her fellow Demon Clan members appeared before the terrified former Great Holy Knight and Fraudrin in Dreyfus' body with Zeldris uttered Meliodas' name as if he knew him. After being informed by Fraudrin of the current events in Britannia, Zeldris suggested that they should head for Edinburgh Castle for recuperation of their severely drained magical powers due to the seal they're trapped in, which everyone agreed and left Zhuhur Valley by flight, leaving a terrified Hendrickson.

Arriving at Edinburgh Castle, Derrierie and her fellow Ten Commandments find it in ruins and concludes that it was Meliodas who caused the destruction of the castle as if there was a great battle fought there. Later on, the Commandments continued to rest and recover their magical power through the souls of humans they devoured whereas Merascylla summoned a Red Demon and Gray Demon to devour souls until there were stopped by three] [[Gilthunder|Holy Knights and Hendrickson and were shocked when they sensed Meliodas regain his full Demon powers at Istar.

Suddenly, Meliodas appeared out of nowhere through Merlin's teleportation and casually greeted the Ten Commandments who were alarmed of his sudden presence, except Estarossa who simply blinked in a laid-back manner and Galan who was determined to finish off where he started. Melodias battled and defeated Galan in less than ten seconds before warning Zeldris that the Seven Deadly Sins will defeat the Ten Commandments with everything they've got. In response, Zeldris and Fraudrin attempted to attack Meliodas from both sides, but he was teleported back to Istar. Galan was angered and humiliated by his defeat at the hands of the "Accursed Demon."

Afterword, Merascylla and Zeldris suggest to split up and move across the land to regain their magic faster and Merascylla split up with someone else.

Abilities and Equipment
Like all members of the Demon Clan, Merascylla is able to utilizing the mysterious jet-black matter as shown forming wings for flight and as a member of the Ten Commandments, she may be exceptionally powerful. Her aura is so powerful that made the normally calm Hendrickson sweat in fear of their mere presence.

Abilities

 * Merascylla is able to use her cloak of darkness to form a portal to summon lesser demons to do her bidding.