finally got my mark of vampire hat so here's the next bit of quest info
NPC: Werewolf Lycan
Location: Vamp Dungeon 4
Requirement: Mark of Vampire & Lv???
He requests Dark Red Note which is dropped by Brass Knight
Quest Name: Lycan's Question
Reward: Count Blood's Notebook, 10,189,123 Exp & 3,985,523 TM Exp
this then spawns 2nd quest:
NPC: Werewolf Lycan
Location: Vamp Dungeon 4
Requirement: Marianne's Portrait & Mary's Diary & Lv???
Diary is from Blood Shield quest and Portrait is from Blood Sword quest
Quest Name: Lycan's Words
Reward: Earring of Sacrifice, 15,283,685 Exp & 5,978,285 TM Exp
Seems you should do Mark of Vampire trade-in quest 1st the shield/sword, but game lets you do shield/sword whenever you get them cause they are that rare....
Finished the quest now and completed the set.