User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-4802891-20170404162419/@comment-4802891-20170412124229

Bingo! The demon is Legion!

This Servant is indeed a bunch of Heroic Spirits summoned in one vessel, using one catalyst (in the case of a regular summoning ritual). They are all bickering and try to take the spotlight, although they all agree the female body is the best to be put on display AND one of the souls in there has enough charisma to shut them all up (which it rarely does, because seeing them being random is entertaining)