The Yellow Death
Crocea Mors:
C Rank Anti-Unit
Caesar's mythical sword, said to be able to kill with a single wound. Since he has been summoned as a Rider rather than a Saber, its potency is reduced, but the effect is nonetheless the same. Upon wounding an enemy, the sword imposes a fate of death upon the enemy - from that moment, their demise becomes inevitable, ordained by destiny. Whether this death is during the battle, or as many as fifteen days afterwards can vary, but since the effect is weaker, longer times are more typical. As such, it can be likened to a 'Doom' status effect in an RPG.
However, any Servant with a high enough capacity to defy fate can avoid being effected with the initial wound, simply by making a succesful Luck check. In addition, if the sword or Rider himself are destroyed, the curse will be ended.
Parade of the Victorious
Currus Triumphator:
B+ Rank Anti-Army
A golden chariot, pulled by four white warhorses, the chariot that Caesar rode for his various Triumphs - including the quadruple Triumph of 46, an enormously elaborate celebration of the consolidation of Rider's power over Rome. Its offensive capabilities and mobility are greater than its ornate appearance might suggest, but it has no special abilities or attacks that can be used in combat. Instead, the greatest ability of Currus Triumphator can only be used after Rider has lead a significant victory against a major foe. Rider becomes adorned with a laurel wreath, and his chariot glows with a golden light. It decreases in speed and offensive capability, but its defences sharply increase. The chariot emanates noise, prana and an 'atmosphere' of frenzied victory. Bystanders drawn to the chariot may feel compelled to join the procession or to celebrate separately. Those with hostile intent towards Rider, or weapons drawn, are attacked by chains coming from the chariot, that attempt to drag them along as prisoners in the procession. The chariot slowly makes its way towards Rider's base - if it makes this journey successfully, Rider gains use of the Skill 'Imperial Privilege', and increases three of his Parameters by one rank each for a full day.
The triumph was created by Romulus, and is the very embodiment of the divine right to rule Rome - when the republic was formed, this power was taken away, and portioned out to deserving heroes a day at a time. It is a celebration that embodies the idea of 'king for a day' - though the actual celebrations would have a slave ride with the triumphant, reminding them of their mortality. When Rome's time as a republic ended, so did the significance of the triumph - none could be king for a day so long as the emperor existed.
This Noble Phantasm is not unique to Rider, though - it belongs to all heroes of the republic who received this blessing, each of whom modifies it in a certain way. For Caesar, whose actions ushered in a new reign of emperors, he can hold on to the bonuses granted by a successful triumph for longer than a day, depending on how significant the victory was.
Legacy of Conquest
The Three-Toed Horse:
A Rank Anti-Army
This horse is a huge, white warhorse that serves as Rider's mount. While a potent mount in its own right, its true strength lies in Rider's deliberate use of the story of Alexander and Bucephalus. In life, Rider attempted to compare himself to the King of Conquerors as a way of painting himself as a mythical hero, destined to conquer the world. Though this succeeded to a certain extent, Rider's own fame matched or even exceeded Alexander's, through his own great deeds. Though he fell short of world conquest, Rider's actions helped establish one of the most enduring empires of the world.
By calling out the name of this Noble Phantasm while riding it, Rider can call into being the wraiths of the soldiers of
Legio Tertia Decima who shared in his borrowed dream. They are shadows of heroic spirits, with a tenuous connection to the world. They flash in and out of the world, fragile enough to be dissipated with a single solid hit. While their offensive capabilities are not reduced, they are hardly enough to harm a Servant except in large numbers. Unless the mana source is exceptional, Rider cannot summon the entire army at the same time.
Ultimately, Rider's dream is just a copy - but who is to say a copy can never surpass the original?