This i do in lords name, inscribed on my Halo is the divinity of lord himself.
Write this sign of your shields, and you shall achieve a perfect victory.
In Hoc Signem Vinces-ChiRho, Holy sign of Lord
[A] [Anti-Army]
An act of faith awe-inspiring, his dream that told him to write the sign of lord, An, Chi Overlayed on top of Rho, that forms the basis for Christos, or the name of Jesus Christ in Greek.
it is a form of divine authority of victory, guided by the hand of lord to commit great deeds in battle, in return for ensuring that faith of Christianity be protected in the realm, a Noble Phantasm that derives power from Constantine's own divine sainthood, a Basis of Ultimate defense and a ensured victory.
The symbol manifests on Ruler's Halo, Luck checks become irrelevant and Ruler gains more power the more he fights his enemies, each blows adds onto the power of Ruler, his halo growing brighter with each blow, Ruler himself is protected from blows in order to ensure a Victory in the name of lord, it is however not a impervious noble phantasm.
Servants that are saints, or otherwise divine in any aspect become able to derive the same power of lord when near Ruler, even if opponent of Ruler, eventually it becomes a stalemate, and fights are decided through personal stats,in addition, Ruler cannot use any other noble phantasm until the 35 minute mark is hit, deactivating the noble phantasm after any other noble phantasm is used, it is more of a trick in the sleeve rather than a main noble phantasm, despite it's grandness
"That which shines under the heavens, our home, the queen of cities-"
Greatest city under the heavens,
Sanctus Civitas Constantinopolis
[B++] [Fortress]
Constantinople, Byzantium, Tsarirgrad, Miklagard. Countless names referring to the capital of the roman empire that was changed after Rome itself became too unstable, it shares the same majesty and divinity that Rome once held, it is the successor to the imperial capital. although it is not rome, it more important than that, It represents the concept of "Severing of tradition" in other words, the very event of the Emperor moving from Rome to Constantinople is the noble Phantasm.
A Bounded field that contains all that Constantinople held until its fall in the 15th century. Including the Theodosian walls and the Hagia Sophia, it is not a reality marble, instead the city is overlaid on top of physical world. It creates a physical barrier between the Ruler and the opponent, the Emperors bodyguard of 500 soldiers is also summoned, Closer to wraiths than individual Heroic Spirits, they serve to man the countless defenses and cannons, in a sense, the city is a "Fortress that projects its power outwards" as it will convert the nearby land to the "Territory of Rome", An Anti-Fortress noble phantasm of a A rank or higher can destroy the city easily, However a servant is forced to destroy a city Wall by Wall, only by striking down Ruler himself will the bounded field be dispersed, Servants who exceed in Destroying fortifications will have an easy time with this, in this sense it is weaker than Lord Camelot, a similar Noble Phantasm.
The truth of my life inscribed on paper, not of a Saint but of a Tyrant
Tyrant and Saint as one
Sanctus et Tyrannus, Constantinus Magnus
[EX] [Anti-Unit (Self)]
The repressed side of what is Saint Constantine, that of a ruthless tyrant who brings pain and suffering for the sake of Christianity, an Unchristian concept for sure, yet it is the very nature of the King of Saints, and the Emperor of Rome.
Held deep in his soul, a side of himself that desires nothing but to slaughter and kill, this is why it is so dangerous to both Constantine and the world around him, and why Constantine is so afraid, nay, Terrified of it activating on accident, which can happen if he spills too much blood, or is brought to the peak of his emotions, it is constantly active on a Passive level, acting as sort of Sadistic Constitution, when a tipping point is reached, it activates.
His spiritual core cracks, and energy starts deluging forth, his halo disappears, replaced by a unholy aura of pure blackness painted in dark red and black, his entire being becomes blackened with rage and violent tendencies, as Adrenaline floods every part of his being, finally stripping him of his Ruler class and Turning him into a Berserker, He loses all his skills as a Ruler and is given an A++ Mad enchantment skill, a monster of violent tendencies brought on by anger, unholy to its greatest, the wish to protect the innocent in his empire has been turned into a wish to slaughter everyone who doesn't follow the way of the Lord, the change is however, not permanent.
this form eats through Mana at a extremely fast rate, as the Change from Ruler to Berserker cuts of the link to the grail, he cannot stay long in this world, 10, minutes at best [Best depending on which side of his sword you are on] He is not a candle, but a constant nuclear explosion in this state.
However one ray of hope still exists, if somebody manages to strike down Ruler [now Berserker] before the 10 minutes mark expires, he will revert back to his ruler form, this will almost certainly kill Ruler, but in rare cases where the hit it just strong enough to knock him out of it, he will revert back to ruler class almost instantly, this is easier said than done, however.