Berserk Sacrifice Emblem

... Is this one of those symbols from ShadowMan?...

no Berserk: one of the greatest anime series ever.

Before a mass demon sacrifice, all those who are to be sacrificed are magically branded by this mark, Guts manages to escape and is plagued by this mark, causes pain, and is haunted constantly

Berserk is so damn amazing. So much violence. I love that episode(s) where he kills 100 men.

Me too, and it wasnt the anime cliche of: 100v1 man, wtfpwn them all in one supermove move,

no special skills, just a sword, and killed them as they came,

like the film 300 ;p

Buts has to be the toughest guy in anime ;p