Heart of Darkness item missing

Platform: PC
Version: I used to play Seralim 3 on 0.0.18. I reached Honored with Erebyss and received the Heart of Darkness efffet. However, I did not receive any item.
Then I updated the game to 1.3.23 and continued to play with the same saved game. I still don’t have the item, however now the effect is off and I cannot find the item or anywhere to toggle it. I tried in Miscellaneous, however I don’t see it there.
Any help on this would be greatly appreciated.
Thank you.

I responded to you on Steam.