User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-2601:8C:601:5692:3C7E:1CB6:535F:4949-20180330232118

Hmm, don't know whether this was revealed in HSDDVol25/SDVol2 or not, but, according to the Jap wiki, it seems that Canis Lykaon seals the evil King of Arcadia, Lycaon, who is apparently the "true anscestor" of the werewolves. Thus, 4/13 original Longinus seal mythological beings (Ddraig, Albion, Nemea(n lion), Lycaon) and 3 were "copies" of holy relics.