Monspeet

is an elite warrior of the Demon Clan, serving directly under the Demon King as a member of the Ten Commandments.

Appearance
Monspiet is a man with dark purple hair and a small mustache. Unlike the other demons (besides Meliodas) his demon markings are on the right side of his face, consisting of three lines, the outer two curving outward. He wears a cloak which covers most of his body and underneath he is shirtless with his torso and arms being covered with dark matter. He is very muscular.

Personality
Monspiet is a gentleman of sorts for a demon and hates rude and ill-mannered people. He acts as an attendant of sorts to Derrierie, always being by her side and catering to her needs.

3,000 years ago
Along with the rest of the Demon Clan, Monspiet was sealed away by the Goddess Clan after losing the Ancient War against the other four races (human, fairies, giants and goddesses).

Albion arc
After Hendrickson managed to remove the seal, Monspiet and the rest of the Ten Commandments 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 Hill for recuperation of their severely drained magical powers, which everyone agreed on. They left Zhuhur Valley by flight, leaving behind a terrified Hendrickson. Arriving at Edinburgh Hill, Monspiet and his fellow Ten Commandments find a castle in ruins and conclude that a great magical power imploded within the castle and that caused the destruction of the it. They also find Meliodas' hole and link it to him.

Resting in the remains of Edinburgh, as they began recovering their magic power, Monspiet discussed the recent awakening of two Albions from the north and the south where he sees Galan heading to the latter direction. After Galan returns, the demons sense Diane heading towards them and Galan heads toward her location along with Monspiet. Both of them overpower Diane until Monspiet is sent flying by Matrona. After recovering from Matrona's surprise attack he suddenly senses the several fairly strong presences coming towards them, one of which suspiciously similar to Meliodas. In order to determine if it's really Meliodas he a move he calls Gokuencho towards them, which burns down a forest and plows through a mountain, only to be stumped when he suddenly can't sense his attack anymore. He questions whether Meliodas used Counter Banish only to deduce that something must have swallowed. it. He laments for a moment that he wasted all the magic he recovered from eating human souls on that move, but accepts the lose shortly after.

Istar arc
He along with the other Ten Commandments are surprised when Meliodas suddenly appears before them, easily defeats Galan, and warns them if they wish to continue the war that ended 3,000 years ago, they will be crushed. In response, Zeldris order that they spread out to take over Britannia. He and Derrierie then leave and arrive at the town of Bellford.

Great Fight Festival arc
He and Derrierie continue their purge in the north of Britannia, having devoured the souls of nearly every person in nine cities and villages and showing no signs of stopping.

Abilities and Equipment
Like all members of the Demon Clan, Monspiet is able to utilize the mysterious jet-black power of darkness, as previously seen by Meliodas, forming wings for flight and other such feats.

As a member of the Ten Commandments, he is exceptionally powerful. His aura, combined with the other commandment's, is so powerful that it made the normally calm Hendrickson sweat in fear by their mere presence. King has noted how incredible his (and Galan and Matrona's) power is. Matrona, similarly noted that she had never seen power like his (and Galan's) and compared him to a living natural disaster.

Abilities

 * Monspiet raises his arm and creates a large, triangular flame with the likeness of a bird. Upon being fired, the flame flies towards its target at an incredible speed, incinerating anything caught in its path and leaving a trail of fire in its wake. The flame is locked on to its target, homing in on it until contact is made.

Derrierie
Monspiet and Derrierie seem to have a very friendly relationship, almost like that of a couple, when resting and regaining their magical powers they are always side by side, with Derrierie resting her head on his leg when they have nothing to do.

Navigation
Monspiet