User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-28209103-20170326051146/@comment-4802891-20170326131337

That was my next question "Is he the kind to sacrifice his army to ensure victory?". I think the "host" is Pyrrhus whom warfare coined a term. Although the fact his army fought for nothing is suspicious, because their loss wasn't in vain entirely.

As for the fictional character, I need to do further research. His power over the dead fueled by grudge makes me think of TM's Angra Mainyu tho.