Big news! There is a total 20% discount for Age of Darkness: Final Stand if you own Ancestors Legacy! There is nothing to hesitate about!
In the meantime, check out "Ancestors Legacy":
https://store.steampowered.com/app/620590/Ancestors_Legacy/
20% discount for Age of Darkness: Final Stand if you own Ancestors Legacy!
Source: Steam Community (opens in a new tab)