This item was a simple alchemy output that gave a buff in the Altar of Blood.

Altar of Blood was removed from PC 2021/08/25:
"Altar of Blood contents are preparing to undergo a renewal, so they will be temporarily unavailable"
and from Console 2021/09/08:
"Altar of Blood has been made temporarily unavailable in preparation of an upcoming renewal"

It is not currently available in the game.