Where can I pick up a blood goblet needed for the Castlemania achievement?

Question

The blood goblet can be dropped by Death Priest Shargon and Vampire Brides but where can I pick the blood goblet needed for the Castlemania achievement?

Answer 1

At Vengoth Castle, you'll need to go through a sealed door on the 3rd floor marked with the green star here. The Blood Goblet will be in the blue star directly south of the door.

From the entrance of the castle, head through the door to the north (assuming you've already unlocked it from the other side), and go up the stairs to +3. There you will find the sealed door marked with the green star.

To pass through the door +1, you will need to go down the trap door and through the door to the north and find your way though to +1 where you'll be able to unseal the door from the inside. 

To pass through the sealed door on +3, you will need to have defeated Arthei located at the top of the tower.  

To reach Arthei, talk to the NPC A Fading Memory located towards the top of the tower and say hi / Kala / Diary / yes / vampire / free soul / awaken. You will then receive a Ghost's Tear. At the top of the tower, use the Tear twice on the Vampire Lord Statue to be teleported into Arthei's room.