The Cap of Hades, Unseen, even to the Gods
Rank: A+++
Range: Anti-Unit
As a result of the limitations of the Grail System, the full manifestation of Athena's affection for Diomedes can not be brought forth. However, the greatest symbol of her assistance and blessing, the wearing of the Cap of Hades to render herself invisible as she guided Diomedes in his attack on Ares, the second God he wounded in a single day, a feat unmatched by any, even Herakles. As such, when summoned under the Assassin class, Athena's blessing manifests as the Cap of Hades, gifted to her chosen champion. When worn by an individual, they become truly invisible, and undetectable via magecraft. When combined with the Presence Concealment of the Assassin Class, the Servant becomes truly undetectable, obtaining the ability to perform guaranteed ambushes at will. Only Servants with high ranks in instinct, Revelation, or a skill or Noble Phantasm that explicitly prevents ambushes can prevent Assassin from getting in a guaranteed first strike.
This Noble Phantasm can be worn by an individual other than Assassin, and still convey it's effect of invisibility. His Presence Concealment will remain unaffected.
The Palladium, Cunning and Guile Unrivaled
Rank: A++
Range: Anti-World
Known singularly for his cunning, ability to improvise schemes, and was widely regarded by the Achaens for his cunning, subtlety, and ability to undertake dangerous tasks to perform the seemingly impossible, Diomedes is a man who moved the world around him to his will with constant success not by changing the fate of the world around him, but by identifying the flow of events and then taking advantage of them for his own benefit. Diomedes was not blessed by great luck or fortune, but even so, he understood the ways of Fate and the Gods, and so ruthlessly used them for his own ends to great success. This culminated in the theft of the Palladium, an event in which it was prophesied by a famous captured Trojan seer that so long as the Palladium, a great statue dedicated towards Athena, lay with Troy's walls, then it would not fall. Odysseus infiltrated the city disguised as a beggar, while Diomedes simply infiltrated the city of Troy by sneaking around it's defenses. Coming across it at last, the two slaughtered the priests and guards protecting it, before Diomedes carried the statue from the city. Incensed by the idea of losing credit for the capture to Diomedes, proud Odysseus attempted to murder his partner in crime and then claim the glory for the capture for himself.
Diomedes promptly vanquished Odysseus and marched him back to the Achaen camp with his arms bound while being pressed forward at the flat of his sword.
As the crystallization of Diomedes acts of cunning and guile, peerless in Greek epics, Assassin can, once per day, invoke the power of this Noble Phantasm. Once activated, Assassin can implement a single plan with a guaranteed success, however this ability has the following two limitations:
It can not be used to culminate in the death of a specific foe.
All steps must be thought through by Assassin in order to completely ensure success. The more specific and detailed the scheme, the powerful the effect of this Noble Phantasm will be, culminating in an effect surpassing even a Marble Phantasm, as Fate rewrites itself in order to accommodate Assassin's scheme.
Any individual who does not have a Luck rank exceeding this Noble Phantasm's rank can resist the effects of this Noble Phantasm affecting them directly by passing a Luck check. Failing to resist this Noble Phantasm results in the opponent operating in accordance with the whims of destiny, as dictated by Assassin.