@Niara - wow, just to confirm, (I somehow didn't notice this): prone is treated as unconscious for spell concentration? That's completely broken

- and probably explains why I lost concentration so many times (but hard to disentangle with surfaces so common).
I never used sacred flame (except in dire need) after the 1st few levels - as as radiant damage its useful in some situations, but fortunately there are many other sources of radiant damage so I just learned to live without it.
On a related note: is there a place that documents all spells mis-implementations/bugs? I see circle of death doesn't behave like it should in 5e - forcing you to pick a target creature as a centre for the effect, when it should be positionable, like a fireball. Really kills spell utility, unless everyone is immune to necrotic damage (which is not true for my party - I can only get resistance).