4 huge shapes, 2 towering over and flanking the 3rdwith the 4th hovering serenely above her companions. The smallest of the 3, an ancient cyborg in grease-stained red robes: Archmagos Dominus Belisarius Caul. Hovering above him on radiant white feathered pinions, the embodiment of the Emperor's will, Saint Celestine.
Flanking Caul, 2 golden-haired giants of Astartes wearing Crusade-pattern Artificer Power Armor, one with long flowing locks, bearing deep green armor and white robes, the other with short, neatly coiffed locks in gold and blue armor. For the first time in 10,000 years, not one, but two Primarchs stand on the blessed soil of Holy Terra: Roboute Guilliman of the 13th Legion, the Ultramarines, and the assumed lost father of the First, the Dark Angel of Caliban: Lion el' Johnson.

Roboute, ever the statesman, is the first to speak:
"At ease, brothers, there is no need for your weapons here. As for the rest of you, get accustomed to the sight of my companions here and of each other, we shall be working together to rebuild my father's faltering creation."
At that many Inquisitors and Priests start to murmur about blasphemy and heresy, which prompts the Lion to scowl and Saint Celestine to speak next, placing a glowing hand gently on the shoulder of the Unforgiven Primarch, her singsong voice soothing all:
"Be at peace, we are all loyal servants of our Lord and Protector, the God-Emperor of Mankind, were that not the case, His Companions would not tolerate your presence so close to the Hallowed Throne!"

At that, a score of golden-armored giants make their presence and intentions known, as the Adeptus Custodes stand at relaxed but curious vigil over the proceedings, and the Captain-General takes his place at Roboute's side, nodding in silent approval.

"Unless the Archmagos or my brother would like to add anything at this point.." The Primarch of the 13th prompts, "Let us begin..."

With that both referred to companions, as well as Celestine, take their positions on the stage. Caul gestures on a data-slate, making the dais slowly rotate and images of the speakers appear on holo-viewers that lower around the arena.

"As many of you are aware, the Imperium is split asunder by the Cicatrix Maladictum, a warp rift so dire it stretches from the Eye of Terror to the Jericho Reach! In addition, the Great Devourer's hunger grows as new Hive Fleets are discovered, the Greenskin menace rages across the stars and the forces of the Immaterium grow in power."

"In addition.." interjects Caul, displaying maps of the subjects Guilliman spoke of, overlaid with locations of lost Forge Worlds "we have lost contact with many critical Forge-Worlds, some containing irreplaceable knowledge!" at this the silent Lion adds "Our traitorous former brothers also grow more brazen, as we see with the loss of Cadia, and the near losses of Fenris and other Chapter Homeworlds."

"Indeed, Archmagos, Brother. In addition to the threats from without, the Imperium is also crumbling from within, a pale shadow of Father's dream.
Before we devolve into more bickering, part of the source of the Imperium's failure... LISTEN AND LEARN!" Booms Roboute.

"I, advised by this council, have devised a plan during the course of my marginally successful Indominus Crusade. Having seen the blight of the Imperium, and the unintended consequences of my own dictate, the Codex Astartes... I propose, nay COMMAND, the re-institution of 20, or MORE, Legions...With my brother as the new Warmaster."