Quote from Unix_Zemor >>

 I'm a little confused. It does not specify each object not worn or carried, so are all objects on a  creature lit up even if the creature itself is not lit up?

 No. Only if they fail the saving throw the objects on them are lit, I believe it's meant to be just objects not on creatures are automatically lit.

How to describe a successful save against this spell as a DM? I have a hard time envisioning what would happen. Do you jump out of the AoE? That doesn't make much sense, but I can't come up with anything else.

Should grant vision and do armor reductions, like in warcraft III! <3 <3 

Quote from LNExtraordinaire >>

How to describe a successful save against this spell as a DM? I have a hard time envisioning what would happen. Do you jump out of the AoE? That doesn't make much sense, but I can't come up with anything else.

 
It is a similar challenge as fireball - how does a rogue “Dex” their way out of taking ANY damage from a 40ft blaze that spreads around corners?

Faerie Fire allows for a bit more imagination and flexibility. Multicolored shapes / sparkles / lines could leap from the caster onto the target area. If someone flinches fast enough, the sparkles just don’t stick, sliding past/over them to illuminate other things. 

Quote from B4tchieBoy >>

How would this affect a invisible stalker?

 They don’t gain any benefit from being invisible; they’re still invisible. There’s just an outline of light, in the shape of an invisible stalker.

How is the DEX save determined for a non spellcaster Drow who gets this spell through the Drow Magic ability? Would it just be 8+PB? or is there another modifier added to it?

Quote from eallison96 >>

How is the DEX save determined for a non spellcaster Drow who gets this spell through the Drow Magic ability? Would it just be 8+PB? or is there another modifier added to it?

 From the Drow entry:

"Charisma is your spellcasting ability for these spells."

So your Spell Save DC would be 8 + CHA + PB.

Just to clarify "any creature" means foes...and friends?

Quote from WOJANI >>

Just to clarify "any creature" means foes...and friends?

Indeed, including the caster themselves.

In terms of the choice of blue, green violet light, can a player choose to have objects outlined in one color and creatures in another color at the same time? Or does everything have to be outlined in the same chosen color. For example, if a player is searching for a mimic among a room of objects, could the player chose objects to be in blue and creatures to be in green, thus revealing which object is actually a mimic?

The wording of this spell is pretty confusing. What counts as an object in dnd? Would a table count as an object, or would each of it's legs? would a flower pot count as an object seperate from what's inside it? Where is the line between object and not an object? If you wanted to be incredibly pedantic, you could say every atom is an object so the glow would be blinding. I get the feeling the clause about objects being illuminated wasn't really thought through 

Yup. Unless the spell description let's you pick targets, it affects everyone within range of the effect. 

objects can have hit points, so if its reasonable for an object to have hit points then it would be effective. i doubt the scenario presented would happen often as objects are rarely invisible, but in general EVERYTHING is an object, but your going to have to do some work as the DM if you have a feck-ton of invisible objects and don't wont to blind your players. I recommend describing everything as having a dim shimmering outline  

how do you buy spells

Does this reveal enemies obscured by the fog cloud spell? 

Quote from Danny_The_Shade >>

If a creature effected by the spell leaves the 20 foot area of the cast radius while still concentrating, is it still glowing and subject to the spell, or do you have to keep the creature in the area for it to continue to work? I'm unsure cause they use the phrase, "for the duration"  but not "that remain in the area of effect." I always kind of saw it as you toss glow paint on everything but have seen it interpreted both ways.

Thoughts?

 Unless the spell specifically says that the target must stay in the area of effect (see witch bolt, for example), the target remains affected until the spell ends even if it wanders away. The 20 foot cube just determines which creatures are targeted at the time the spell is cast.

Isn't this available for Swarm-keeper ranger as well? It's not listed.

whack that raw this works even if they pass the saving throw. it describes the objects as being outlined prior to the save, so presumably they're affected regardless of whether or not they are ALSO outlined in light

Quote from Chalkbrood >>

whack that raw this works even if they pass the saving throw. it describes the objects as being outlined prior to the save, so presumably they're affected regardless of whether or not they are ALSO outlined in light

"Each object in a 20-foot cube within range is outlined in blue, green, or violet light (your choice). Any creature in the area when the spell is cast is also outlined in light if it fails a Dexterity saving throw."

Objects don't make saving throws, creatures do. 

It says “For the duration, objects and affected creatures shed dim light in a 10-foot radius.”   two questions:

1. Does this mean players that are more than 10 feet away won’t see the outline of the creature if that creature is invisible?  If yes, then an invisible creature can run out of that 10 foot range.  

2. Even if a PC can see the creature (e.g., not invisible), does the PC get advantage on ranged attacks if the PC is more than 10?