I might not have specified that, but I wanted it to signify that, and that's how I saw it
as for the MCs, well, Xanriel technically had all the control over them, they just listened to him. Exriel and Xanriel, when you get right down to it, are the same person, just Xanriel was kinda crazy.
Exriel symbolized the corruption inside Xanriel, right? But now Xanriel is the Master of Light, so he no longer has that corruption inside himself. Xanriel assumes that the corruption has been completely purified and destroyed; but it could be that the corruption is simply removed from Xanriel. You didn't specify what Miracle did when he purified Xanriel; maybe he simply removed that corruption.
Editing in progress.
Jonathan gritted his teeth as he blocked a blow from Johann. Jonathan's body was surrounded by a thick, impenetrable aura of darkness. This aura was different from his Dark Shroud ability, which hides his presence; this aura was an armor, to protect Jonathan from Johann's pestilent energies. Jonathan could not afford to let even an iota of Johann's power touch him, because one as powerful as Johann could bring death with a single touch.
"Afrait to let my attacks touch you, eh?" Johann cackled maniacally as he let loose another bolt of necromantic energy. Swerving to the side, Jonathan launched an energy bolt of his own, but Johann dodged it in a motion that was identical to Jonathan's. His and his doppelganger's understandings of each other's fighting styles were too thorough, and neither of them had succeeded in landing a blow onto his opponent.
Realizing that none of his conventional attacks would work on Jonathan, Johann used an ability that was unique to a Death elemental: necromancy. With one swift motion Johann stuck his bone blade Arsenic into the ground beneath him, and unleashed a wave of deathly power into the soil. The ground trembled, atrophied and cracked; spikes of sickly gray bone protruded out from the earth. Jonathan's brows furrowed, as he saw his double creating a Boneyard out of nothing.
"Let's see how you deal with this," Johann sneered as he pulled Arsenic out of the earth. The moment his blade left the soil, the ground started to shake once more. Then, hands made of bone began to dig themselves out of the dirt. Within moments, more than two dozens of undead skeletons pulled themselves out of the earth, their eyeless sockets glowing with eerie indigo phosphorescence.
Letting out ghastly moans, the skeletons dashed at Jonathan, their fleshless hands glowing with purple energy. One of them grabbed at Jonathan, but he dodged; Jonathan then crushed the skeleton's rib cage to bits with a single blow. But Jonathan's special power, Drain Life, did not help him there; there was no blood to absorb in the skeleton's lifeless body.
Unable to survive Jonathan's blow, that one skeleton crumbled to pieces. But just as the skeleton's broken body hit the ground, two more skeletal hands protruded from the earth where the first had fallen. In an instant, two skeletons dug themselves out of the dirt, purple necromantic energies emanating from their bodies. Jonathan struck out at the two new skeletons with a vicious cleave, breaking them apart in one blow; but as they fell and returned to the earth,
four more skeletons then appeared.
Cursing under his breath, Jonathan lashed out at the two dozens of skeletons, unleashing a massive wave of darkness. The dark energies engulfed the skeletons, breaking them apart. But as the dark wave dissipated, Jonathan's eyes widened at the four dozens of skeletons that were newly created before him. Then he glanced at Johann, and was shocked to see layers upon thick layers of spiked bones, forming an impenetrable Bone Wall.
Johann was creating an army of undead, and all Jonathan had been doing was making that army even stronger. He must do something quick, else he would soon be overwhelmed...
Done.
So yeah, Johann basically glitched Boneyard so that one dead Skeleton generates two new Skeletons. And Jonathan just triggered an equivalent of Rain of Fire + Fireflies + Bone Wall combo.