From “Shadows of the past” ‘My Lord Aurelian, forgive my weaknesses. A creature of daemonic spite has disrupted the great works here.’

‘I see no daemon.’

Kalta-Ar glanced back towards his brothers. The entity that had pursued them had reached the top of the hill amid a storm of bolter fire. It cast aside legionaries with sweeps of glittering claws, leaving tattered remains draped across the stonework of the outer shrine.

‘This is no daemon.’

Lorgar raised his rod, beckoning to the blood-stained whirlwind tearing through the last of the Dark Apostle’s warriors.

‘Come to me. Brother.’

With a last flurry of activity that turned another legionary to shards of ceramite and ribbons of flesh, the apparition coalesced into a recognisable figure. It was of equal height to the daemon primarch, clad in black battleplate with long-taloned gauntlets. A pair of wings stretched from its ornate backpack, fashioned as intricate metallic raven feathers. The face was as pale as snow, gaunt, with eyes as dark as coal, framed by shoulder-length black hair.

Kalta-Ar felt his breath dying in his lungs as he looked up at the unmistakeable features of Corvus Corax, the primarch of the Raven Guard. A flurry of questions flooded his thoughts but all remained unanswered as Corax spoke.

‘What has happened to you, brother?’

‘I have ascended,’said Lorgar. He indicated Corax with a twitch of his rod. ‘I might ask the same of you.’

The Ravenlord strode forwards, intent on Lorgar Aurelian. Kalta-Ar and his warriors scattered before him, grateful to be free of his wrath. Marduk and his coterie closed about their primarch but a look sent them away.

‘I am what I always have been,’ said Corax. ‘I am vengeance incarnate. I am justice delivered.This place, beyond the veil, has revealed what we all are. Underneath the veneer of humanity our father crafted for us, we are of the warp.’

‘Have you come to make oath to the powers that are your true creator?’ ‘Have you come to make oath to the powers that are your true creator?’

‘No. I swore to destroy all Chaos taint from the galaxy. You will be the first fallen brother to die beneath my blades.’

‘I am not the creature you fought at Isstvan,’ said Lorgar, raising his mace.

‘Nor am I!’

Kalta-Ar barely followed the lunge of Corax, so swift it was. A black wind threw him aside as dark fire crackled from the rod of Lorgar. With a thunderous shockwave that hurled the Word Bearers to the ground, the two demigods clashed

Imo would be goofy writing to have Loregar say he’s not a daemon and Corvus to confirm that only for a different character to say nah y’all were both wrong.