A/N: Please note the information about the heroic cards, type moon character, or any fiction character I got in wiki and some I modified or made up in order to fit the heroic cards themes. If you found something that doesn't match or doesn't existence info in wiki again I made those info up to fit the story.
Lelouch Log:
During the night Lelouch heard a young girl scream. He follows the sound and found a young girl trap in a large pit fill with large black worms. Seeing how the harm it doing to the girl Lelouch jump into the pit not knowing the danger of those worms. After dragging the girl out of the pit while killing a few worms not realizing some of the worms manage to invade inside Lelouch's body.
Once out of clear it took some time for the girl to open up to Lelouch which she later tell her name is Sakura back then she was quiet and emotionless but warm up slowly being with Lelouch as Sakura remained his sister Nunnally.
Few days later Lelouch was starting feeling the effect from the worms inside his body. Sakura recognize the symptoms and explain it the crest worms are the cause which she also have them as well. When the worms are inside the host is a male, they consume their bone marrow and part of the brain after shattering his spine, making him crippled in the process. When it is a female, they absorb the mental energy created after sexual stimulation is made through the nervous system.
The Matou crest worms give an addiction as it forcibly confers to one's body the capacity to use Magecraft. The more the host uses magic circuit the more the crest worms become active as they eat prana being produce from the host. However, doing so not only will greatly shorten the host remaining lifespan but also the process is in itself incredibly painful. Worse Sakura doesn't know any method that can purges the worms out of the host body.
Thinking the problem and the option he has. Lelouch come up by using Shirou Archer Card and trace Avalon sheath to heal and purge the worms out. Avalon manages to heal Lelouch and Sakura body unfortunately it didn't purge the worms out of their system. However Lelouch believe there could be a Heroic Card capably purging the worms so they journey the land to find one.
Until then using Avalon and Ken Caster Card using the healing food to restore their health is the best he have available.
During their journey of every night Lelouch notice those worms though slow seem to follow whatever they go while the Shade creature back off where the worms are. He took advantage by staying near the worms that the Shade won't come while far enough that the worms won't harm them.
Later on Lelouch face a teenage girl wearing a black dress, red vein like mark in her skin, and white long hair who later Lelouch found out her name is Dark Sakura. It was Lelouch first battle against a Heroic Spirit a very dangerous and powerful one.
It was thank to Sakura that she found a Heroic Card Ruler name Amakusa Shirou Tokisada. Using his ability the Baptism Sacrament that is effect against spirit with Sakura add power together they barely defeat Dark Sakura. As she was fading away Lelouch found out as Sakura also is fading that Dark Sakura and Sakura are one of the same.
Lelouch sadden that he couldn't save the child Sakura but the girl correct him saying he did save her as she is finally free from her torment while she fade away Sakura's smile saying thanks.
End Log
Sakura Matou
Class: Grail
Sex: Female
Stats
STR: D
CON: A
AGI: D
MGI: EX
LCK: D
Class Abilities
Grail Vessel: EX
Boost and supple extra prana for Heroic Spirit
Heroic Chronicle: D
It gives the knowledge of the Heroic Spirit identity and history from the throne of hero records.
Personal skills
Imaginary Numbers: D (EX)
A power highly effective against spiritual beings, but not so potent against those whose body is not made out of Ether. When the Matou clan restraining spells are used along with this, it is possible to imprison and skewer the target into a separate dimension composed entirely of shadows. Furthermore, when in Dark Sakura mode she is able to use this ability even against normal humans.
Familiars: D (A)
Sakura Matou's familiars made out of her Shadow element and crest worms. Under normal circumstances the Shadow creature are extremely small but when she is in Dark Sakura, their sizes increases vastly and start acting as a materialized curse.
Self-Regenerate: D (EX)
Sakura has a miner self-regenerate capability when she in Dark Sakura, she can spontaneously regenerate, allowing her to recover from mortal wounds within minutes of receiving them.
Dark Sakura: EX
Dark Sakura has an unlimited supply of Mana, but the amount she can expel at any derivative is limited by her number of magic circuits. Her touch is highly corrosive, dissolving organic matter and converting the base elements into pure Mana. When an astral being, such as a Servant, comes into contract with Dark Sakura's shadows, that Servant's mentality is corrupted by her evil influence, while their offensive power is considerably augmented. She is also capable of forming tentacle appendages from her body, as well as birthing shadow monstrosities that follow her general intent but otherwise operate independently.
Noble Phantasms
None
Shirou Kotomine
Amakusa Shirou Tokisada
Class: Ruler
Sex: Male
Stats
STR: C
CON: E
AGI: B
MGI: C
LCK: A
Class Abilities
Servants participating:
Reveal the identity, stats, and Noble Phantasms
Servant position:
Within 10 Kilometers wide radius allow him to reveal the heroic spirit position which even overcome Assassin's Presence Concealment ability and learn their identity.
Personal skills
Assembly of the Eighth Sacrament: C
Baptism Sacrament: A
A chant is a key of providence that eliminates wondering souls with the holy words of the Bible. It is the purification and elevating of a wayward soul through the teachings of the Lord by sending a ghost to its "throne" which is very effect against Heroic Spirit.
Noble Phantasms
Heaven's messenger:
Defense of Hara Castle: