Hey Jim Tigwell, I'm curious about your interpretation of the 5E version of detect evil. It's less powerful, and described more like a passive sense that you can focus.  I'm curious how it works in your world. Can it be done subtly? What would be the outward indications that you're using it? Does it require a use to get any indication, or would you get the faint smell of evil, etc, even without using the action to focus it? 

Just want to know how to play it when it comes up in game.

D i v i n e S e n s e

The presence o f strong evil registers on your senses like
a noxious odor, and powerful good rings like heavenly
music in your ears. As an action, you can open your
awareness to detect such forces. Until the end o f your
next turn, you know the location o f any celestial, fiend,
or undead within 60 feet o f you that is not behind total
cover. You know the type (celestial, fiend, or undead) o f
any being w hose presence you sense, but not its identity
(the vampire Count Strahd von Zarovich, for instance).
Within the same radius, you also detect the presence
o f any place or object that has been consecrated or
desecrated, as with the hallow spell.
You can use this feature a number of times equal to
1 + your Charisma modifier. When you finish a long rest,
you regain all expended uses.