Originally Posted by gaymer
Additionally, PRONE no longer auto-fails DEX saving throws so Sacred Flame is no longer 100% success on PRONE enemies. This should be addressed by Larian because I'm sick of them changing stuff.
Auto-failing Dex STs isn't actually an effect of prone, according to 5e RAW. This isn't an instance of Larian changing rules.
Originally Posted by 5e rules for Prone
  • A prone creature’s only Movement option is to crawl, unless it stands up and thereby ends the condition.
  • The creature has disadvantage on Attack rolls.
  • An Attack roll against the creature has advantage if the attacker is within 5 feet of the creature. Otherwise, the Attack roll has disadvantage.
I think prone creatures *should* have disadvantage on Dex STs, because that makes a lot of sense, but alas...