Indura

is the true nature of demons that possess seven hearts and a power level exceeding 50,000.

Appearance
Indura are varied in appearance, resembling monsters, chimeras, or mutated animals.

Personality
Despite their origin as a member of the Demon Clan, they are essentially wild creatures without the ability to reason, having exchanged that as well as their original form for power.

Description
In order to attain their Indura form,a demon must have a power level of fifty-one thousand and make a contract with the darkness, by exchanging six of their seven hearts  and also their ability to reason via sacrifice they successfully initiate the transformtion. The resulting beast possesses immense magical power and slowly turns into an ominous figure as time passes.

Known as "legendary beasts", the Indura are widely feared even within the Demon Realm, and are known to come in different types. The Indura resulting from the Commandments who got the decrees bestowed upon them by the Demon King are called the Induras of Favor (主恩, Shuon).

Indura bearing other titles such as Ashes (灰燼, Kaijin), Time (星霜 Seisō), Resentment (怨嗟, Ensa), Thunder (遠雷, Enrai), or Retribution (業報, Gōhō) are still roaming around the Demon Realm.

Known demons that turn into Indura include Derieri, Monspeet and Baruja.

Abilities/Equipment
The Induras are noted to possess absolutely massive power; when Derieri and Monspet transformed into their Indura Forms they both possessed enough power to overwhelm and nearly kill three of the Four Archangels of the Goddess Clan. Even Meliodas, the former leader of the Ten Commandments, stated that the only "real" way to defeat them was to simply allow them to rampage to their heart's content until they simply kill themselves from exhaustion, further proving the depth of their power.

Trivia

 * Galand stated that only demons of the Highest rank, like the Ten Commandments, who possess power levels within fifty one thousand and beyond can achieve the Indura Transformation as if a demon with a power level lower than that cannot withstand the strain of the transformation and will only die.