Thread:Hitsuji Mamoru/@comment-30314236-20180822154337/@comment-4802891-20180822161413

There are two reasons for that. For once, all Hassans are wraiths summoned under the name Hassan i-Sabbah. None were recorded individually in History, By that mandate, as long as one is a middle-eastern devout who kills on command and in the name of God, you should qualify.

The other reason is that the Snowfield Holy Grail War is a half-assed ritual that breaks the rule big time, allowing Narita to make anything possible. I guess one of the broken rules is that the 0.01% turns into a 100% chance to summon the Angra Mainyu (read "a nobody with a story to tell") of the Hassans.