The Assassin Class Card is found in the Fuyuki Forest. The Assassins quickly overwhelm Illya, Miyu Edelfelt, Rin Tohsaka, and Luviagelita Edelfelt. Illya is poisoned, and at the brink of death, she unknowningly released her mana in a massive explosion that manages to defeat the Assassin Class Card while also putting her compainions in danger.
Illya later Includes it while fighting Gilgamesh and Installs it while fighting Angelica.
Including the Assassin Class Card allows for the Mystic Code, Magical Ruby in the case of Illyasviel von Einzbern, to become a decoy the exact image of the user. The user will be concealed for a few seconds, but will be revealed after the decoy is destroyed. Although the decoy takes damage, the item used to transform remain intact after returning to its normal form.
Installing the Assassin Class Card gives the user a version of Assassin's garb, grants use of their daggers, and transforms the Kaleidostick into one of Assassin's skull masks. Once clad like this, the user can still make use of the duplicates with Zabaniya, but also gains the ability of Assassin's Presence Concealment.
“A person well-versed retorted with "hey, isn't this the 4th one?" at the numerous excuses I had the pleasure of making up, yup, that's why. I want to see the Illya who pulls out opponent's hearts with her right hand as well.”
Zabaniya: Delusional Illusion: E
The item used to include (in Ilya's case her stick) takes the spitting image of the user; it becomes a decoy. At the same time, for a few seconds the user will also be concealed. After the decoy is destroyed the user will be revealed.
Ability of assassin hero XXXX is obtained. Details unknown.
A person well-versed retorted with "hey, isn't this the 4th one?" at the numerous excuses I had the pleasure of making up, yup, that's why. I want to see the Ilya who pulls out opponent's hearts with her right hand as well.
Zabaniya: Delusional Illusion: C+
A Noble Phantasm ability that splits one's personality and soul into discrete individuals. At the end of the day since one is only being split the total power does not change, therefore the ability of a single partition is degraded.
Originally 80 partitions can be made however, since it seems to have greatly deteriorated the maximum number is limited.