About Baldur's Gate

companion - the familiar, if the player chooses a mage class (no other mages are allowed to have familiars for some reason).
prophecy - in Candlekeep the chanters speak the prophecies of Alaundo.

--- averted (not worth tagging)
autoregen - characters with abnormally high constitution regenerate health automatically (and even then so slowly it hardly matters), most characters don't have it this high.