I should add that when I went "up there" and visited Kain by partial projection, he gave me a room and had me drink one drop of "original blood". He's been waiting for people to make up there, and even if you do so with just one layer, if you are able to be solid up there, it's enough.

After I used this new total core on myself, the "drop" of original blood from him fell into the cell. I believe it's possible that it's necessary to have a very personalized body to be able to use this original sharp vampirism, and that is why I was drawn to create this.