Spoiler - new Sanguinius model leaked

Assassin - Part 25 - Blood Oath, Conclusion

The Phalanx appeared beside the Vengeful Spirit materializing via a perfect jump from warp space. Batteries upon batteries of nova cannons let loose point blank salvoes tearing into the exposed side of the Chaos war vessel. The crescendo tore through exposing crew to the sudden death from the deadly cold vacuum of dead space. Again the nova cannons unleashed another barrage ripping through the last of the void shields. Tilting to apogee the Phalanx speared into the next section of the Vengeful Spirit, boarding torpedoes tore into the outer breaches vaporizing hardened void armor as their claws sluiced through securing breaches for ready teams of Templars to enter the barge.

Warning klaxons sounded within the command deck. "We have been penetrated." said the skipper. Abbadon shot forth from his throne grasping at the second cask holding the immortal Drachyen. "Justarein assemble." commanded the Warlord as he gripped the hilt of his daemon sword. Explosions ripped through the chamber exposing the occupants. A sea of black armored Marines began to climb through the burning wreckage firing ranged weapons into the tight confines. Servitors died in throes as the Templars came forward.

"I smell your taint." came a cold voice. Crashing through a rended wall a winged giant appeared clasping a burning sword. "For Sigismund!" The blade came to life blazing so bright all were blinded, even the Archfiend could not see. The sword swept through like a scythe of death and everything that stood in its way was laid to eternal rest as it consumed their warped souls. Sanguinius cut through the Justearin within the blink of an eye then again the Templars' bolters sang Death all trained on Abbadon. Turning to fight Abbadon lifted the Talon to ward off the frontal attack. "Cease fire." commanded the Angel. "Are you ready to test your mettle versus a true warrior of the Emperor's blood?" Abbadon charged spraying the Primarch with the combi bolter component of the Talon. Sanguinius dodged each shot as he advanced straight ahead.

There came an involuntary cry of pain as the Black Sword speared through the Archfiend's chest puncturing both hearts with one swift strike. Outside the immense gravity well generated by the Phalanx began to consume the remains of the Vengeful Spirit. One huge black gauntlet cradled Abbadon's skull as the Angel gazed into his blind eyes. "Bring your precious weapons to bare now." taunted Sanguinius. The crushing power of the Primarch pulled the skull free exposing the pale neck. The tip of a deep ugly scar ruptured as his fangs plunged into the pulsing vein. The blood and life energy stored within the tainted vessel tasted so bitter. Sanguinius drank deep. Abaddon ceased to struggle as the Angel released him letting the shrunken body collapse upon the deck. The Archfiend looked up to see only Sanguinius standing over him, the daemon sword had clattered to the floor, then the tip of the Black Sword burst through his brain pan butchering the grey matter stored within the ruined skull.

Assassin - Part 21 - Excalibur

Sanguinius fitted the last of the tight clasps into his suit of black armor as they clicked into place. The plate was pitch black devoid of any marks other than a fractal pattern minutia of filigree deeply etched into the interlocking plates. His wings were furled tightly back hidden from sight within the combat chamber. "I need a weapon."

The Tech Marine bent over unlocking a hidden war chest. The hinges worked seamlessly as the top slowly slid open revealing a long black sword stored in an iron scabbard. A pair of golden Chymera formed the guard of the hilt.

"The blade is said to date back to original advent of mankind, forged on an isle known as Avalon. Caledfwich, the magical sword first wielded by Fergus mac Róich. The black steel was forged from heavy ores plundered from the deepest depths of the darkest ocean on Terra. Much later it was reforged again during the Age of Dark Techology and reunited with the original scabbard. Both are arcane and possess their own set of other worldly power. It said when Fergus first drew the blade its light shone brighter than one hundred thousand burning torches, blinding all his enemies. Keep the scabbard with you at all times for no injury will you suffer. The blade's astral light is holy and stored directly from the Sun."

Sanguinius bent on knee clasping the long hilt. He felt a steady pleasant thrum purring as he withdrew the sword. "Truly a weapon befitting a Primarch." He looked down upon the Ancient word etched into the blade 'Excalibur'.

"The Black Sword was last wielded by our finest champion and he slew untold number of Chaos Champions. Only one pure of heart can master this blade." said the Templar.

"Sigismund." the Primarch replied.

"Yes." said the Tech Marine. "They will both serve you well."

There drew he forth the brand Excalibur,
And o’er him, drawing it, the winter moon,
Brightening the skirts of a long cloud, ran forth
And sparkled keen with frost against the hilt:
For all the haft twinkled with diamond sparks,
Myriads of topaz-lights, and jacinth-work
Of subtlest jewellery.