Too Short For An Omake (Yet!): Blackguards
@Questor
Those who fought against the Army of Darkness that day thought they had faced the very depths of Sombra's depravity - what could be worse than the legions of enslaved soldiers, than the unwilling torn apart and stitched together into Abominations, than his own people eradicated, consumed and resurrected only to be broken to his will. What could be worse? - Those who served him willingly.
In the Crystal Empire tales are told, whispered under tears - of Those!
Those who opened the Gate even when they saw his True Nature. Those who turned against their True King. Those who sold out the last nests of Resistance.
Of course Sombra tested even Them, to the breaking point, and beyond. Their Souls and their Bodies, their Minds and their Hearts.
Those who served him for power, died quickly and painfully, for he would permit no power but his own. One look into their soul, and it was torn out!
Those who served him to save themselves failed the First Trial - to cut out their own heart. Their bleeding carcasses were consumed by the others as part of their Second Trial.
Those who served him to save someone else were given the option to die for them, or fight them to the death in the Third Trial. Either way, both of them died. For Sombra knew the Power of the Heart, even one as black as his own.
Those who served him to one day take revenge, were challenged in personal combat, for he knew the smoldering flame in their hearts from his own. It was their Third Trial, and their last.
Those who served him out of hatred for their own kind were given domain over each and every pony they knew as their Third Trial. If the living did not soon envy the dead, their dominator would join the latter.*
Those who served him out of personal loyalty were tested the most. They had to witness all Trials, and endure every torture the Hateful or Sombra could think of. Those that endured, were made whole again, and more than ponies.
Those who served him out of Love - it is said he showed them his innermost Heart, and they were never heard from again. Some suspect they became his Silent Circle, or his secret harem. Others say he consumed their hearts, and souls.
* The only exception was made for those who made their charges beg for more torture - they were put in charge of the breeding pens!