Heroic Spirit Lore ~Asterios~ (英霊伝承 ～アステリオス～, Eirei Denshō ~Asuteriosu~?) is a 8 pages short novel written by Yuuichirou Higashide and illustrated by Shima Drill. It was published in TYPE-MOON Ace Volume 11 magazine on April 15, 2016.
Plot
A short story about Asterios that details his death at the hands of Theseus and Theseus' sympathy towards him.