Commandment

A is a unique power created by the Demon King over 3,000 years ago. There are ten in total and each has a unique curse bestowed upon anyone who breaks its rule.

Overview
The Commandments are a set of ten decrees that were created by the Demon King when he took half of his power and split that into ten fragments to create the Ten Commandments, who derive their group name from their powers.

Each Commandment has a specific rule that, if broken, will place a specific curse on the victim(s) depending on what the Commandment itself is centered around. The power of the Commandments is absolute and affects anyone who breaks its rule, even the wielder itself. However, anyone who has another Commandment is immune to all others except their own. Those who were given a Grace or a divine blessing by the Supreme Deity are also immune to the Commandments’ effects as well.

The curses will only be lifted if the victim defeats its wielder or at the victim's death. The Commandments can be removed from their wielder using a special spell, but only if he or she gives their consent or if they are left powerless, unable to fight or die.

Absorbing a Commandment turns any non-demon race into a demon, giving them the standard demonic powers as well though in the case of a goddess while gaining such powers, their souls and minds would be devoured and warped by the Commendment due to being the polar opposites of demons. Though Mael, the only goddess to receive a Commandment, was bestowed one after his memories were altered by Gowther and his doll so it’s unknown if the same effect applies if he had his real memories intact. Moreover, if anyone, demon or not, tries to take in more than one Commandment, it would destroy them. Monspeet himself said only the sons of the Demon King, Meliodas and Zeldris, could survive such a feat, but it is revealed that Mael as Estarossa is capable of doing so too, but at the cost of warping his broken soul even more and in the end losing his sanity.

After Gowther’s memory spell wore off and Mael regained his memories, his body holding three Commandments took on a mixed appearance of a goddess and a demon where his left half is that of a demon and the right is that of a goddess. In this form, he’s able to use both his holy and demonic powers and even combine them together. After absorbing a fouth, Mael was able to materialize the Commandments in physical forms and use them for various attacks.

When Gowther entered into Mael's mind it is revealed that the Commandments themselves seem to have a certain degree of sentience, as they attempted to manipulate Mael into handing over his body to them and also attempted to banish Gowther from Mael's mind to prevent him from interferring.

Meliodas states that by absorbing all ten of the Commandments, he can reach a level of power equal to that of the Demon King and Supreme Deity, as he is doing so to end the curse placed on Elizabeth Liones. However, it is later revealed that absorbing all the Commandments really means becoming the new vessel of the Demon King, this being the true reason why he created them.

After absorbing all the Commandments, the vessel can undergo changes, as Meliodas and Zeldris' appearance physically ages into an adult.

The Demon King stated that the Commandments can feed directly to him information of the holders, to keep an eye on them, as to prevent any rebellion attempt against the Demon King.

The Ten Decrees

 * Anyone who holds hatred in the presence of the wielder will be unable to afflict harm on anyone else.
 * It was previously held by Meliodas and later by Estarossa, then Meliodas again and finally Zeldris.
 * Anyone who lies or goes back on their word in the presence of the wielder will be petrified into stone.
 * It was previously held by Galand, later absorbed by Estarossa, then Meliodas and finally Zeldris.
 * Anyone who shows faithlessness in the presence of the wielder will have their eyes set ablaze.
 * It was previously held by Melascula, later absorbed by Meliodas and finally Zeldris.
 * Anyone who shows their back to the wielder will become an obedient slave of the Demon King and by extension, his representative and youngest son, Zeldris.
 * It was originally held by Calmadios, then Zeldris, who later forfeited it to Meliodas, then Zeldris again.
 * Anyone who holds desire from another person loses their memories, emotions, and sense of self.
 * It was previously held by Gowther, then taken by Zeldris, who later forfeited it to Meliodas and finally absorbed by Zeldris.
 * Anyone who kills in the presence of the wielder will have their own time stolen away from them until they die from old age.
 * It was previously held by Grayroad, later taken by Meliodas then Zeldris.
 * The curse is unknown.
 * It was previously held by Gloxinia, but after he left the Ten Commandments it was taken back by Zeldris, who then forfeited it to Meliodas, then absorbed by Zeldris.
 * The curse is unknown.
 * It was previously held by Drole, but after he left the Ten Commandments it was taken back by Zeldris, who then forfeited it to Meliodas, then absorbed by Zeldris.
 * Anyone who expresses hidden feeling and/or emotions will have their voice blocked.
 * It was previously held by Monspeet, later absorbed by Estarossa, then Meliodas and then Zeldris.
 * The curse is unknown.
 * It was previously held by Derieri, later absorbed by Estarossa, then Meliodas and then Zeldris.

Techniques

 * Mael takes the Love Commandment and uses it to create an incredibly destructive explosion. The effects of the Commandment turns any pain and suffering in the opponents into pleasure, lending them to grow sleepy and finally die.
 * Mael takes the Truth Commandment and uses it to create a bell capable of dispersing any illusion.
 * Mael takes the Reticence Commandment and uses it to craft a scythe that brands anyone hit with the cursed seal of the Commandment, sealing their magic.
 * Mael takes the Purity Commandment and uses it to create a big incense which smoke make people to be immobilised by a great preassure and suffer hallucinations of what their hearts truly desires.

Trivia

 * Each Commandment is directly inspired by one of the 10 Commandments of the Bible :
 * "You shall have no other gods before Me" corresponds to the Commandments of Piety 
 * "You shall not make idols" corresponds to the Commandments of Faith
 * "You shall not take the name of the LORD your God in vain" corresponds to the Commandments of Reticence
 * "Remember the Sabbath day, to keep it holy" corresponds to the Commandments of Repose.
 * "Honor your father and your mother" corresponds to the Commandments of Love
 * "You shall not murder" corresponds to the Commandments of Pacifism.
 * "You shall not commit adultery" corresponds to the Commandments of Purity.
 * "You shall not steal" corresponds to the Commandments of Patience.
 * "You shall not bear false witness against your neighbor" corresponds to the Commandments of Truth.
 * "You shall not covet" corresponds to the Commandments of Selflessness.