When you found Strahd’s journal in the chapel, Anton was the one who opened it up and attempted to read it. This is what he read:
Anton read aloud to the group. "It's hard to see. The ink is faded. Let's see...." He spoke hesitantly. " 'I am The Ancient, I am The Land. My beg... My beginnings are....' Damn." Anton looked up. "I can't make it out. The writing is too faded."
… and then, a few pages later ...
"There's more. I can read this." He looked up at the group, then began to read. " 'The death she saw in me turned her from me. And so I came to hate death, my death. My hate is very strong; I would not be called 'death' so soon'.
" 'I made a pact with death, a pact of blood. On the day of the wedding, I killed Sergei, my brother. My pact was sealed with his blood.
" 'I... I found Tatyana we...' Dammit!" Anton turned a page. "It's too faint to.... wait a minute. 'I have studied...' Then it gets faint again. Here's some more. Umm, 'youth, and I curse the liv'... the living? Then over here, 'the sun and light I fear.....little else can.....through my heart does not kill.....' "
Anton paused a moment, then looked up. " 'that cursed sword that Sergei......I must dispose of that awful.... hate it as much as the sun."
Anton turned the page. " 'I have often hunted for Tatyana. I have even felt her within my grasp, but she escapes. She taunts me! She taunts me! What will it take to bend her love for me?
" 'I now reside far below Ravenloft. I live among the dead and sleep beneath the very stones of this hollow castle of despair. I shall seal shut the walls of the stairs that none may disturb me.' "
Anton turned a few more pages, but if anything was ever written on them, there was no sign of it.