|Also known as:||Old Man of the Mountain|
|Appears in:||Fate/strange fake|
|Character type:||Servant (Master: Faldeus)|
Upon meeting his Master, True Assassin questions Faldeus' convictions and whether or not they are worth taking the lives of others for, declaring that is what it is to form a contract with him. He agrees to be his Master's Shadow so long as he does not abandon his convictions.
Assassin's Presence Concealment is EX, and drops to A+ when he starts to attack. His other parameters and Noble Phantasms are obscured. He also appears to be able to influence his own Master's actions to, at least, some small degree, causing him to write upon a sheet of paper, "I ask of you, are you my Master?", and possibly can manipulate darkness as well, shutting off lights in a hall when he encounters Faldeus for the first time to establish their contract or in his office during verbal encounters.
- ↑ 1.0 1.1 1.2 1.3
 Fate/strange fake - Volume 2 - Servant status: True Assassin
Class: True Assassin
Master: Faldeus Dioland
True name: Hassan-i-Sabbah
Strength: Even Faldeus cannot confirm
Endurance: Even Faldeus cannot confirm
Agility: Even Faldeus cannot confirm
Magic: Even Faldeus cannot confirm
Luck: Even Faldeus cannot confirm
Noble Phantasm: Even Faldeus cannot confirm
■ Presence Concealment: EX
Becomes one with the World itself. The moment one shifts to attack, it becomes A+.
■ Shadow Lantern: A
Skill that allows one to become one with the shadows. Because he can gain surrounding magical energy from the darkness, as long as he does not materialize he almost doesn't need the Master's magical energy supply. As long as a command spell is not used, it is possible to conceal one's status from the Master.
■ (Obscured in volume 2)
Maximum Targets: ???