Faerie Fire: Uses, and effects

For reference: 

Faerie Fire Spell:

Due to the wording of "Affected creature or object have advatage," does that mean, since the creature makes a saving throw, which affects them regardless of what they roll. Does a creature that attacks a different affected creature have advantage even if the affected creature still succeeded on the saving throw?

Note: I know that some people are going to say that this is a non-good faith interpretation, I know it's not, and I wouldn't rule it like this, I simply want to know people's opinion on this topic

If you know you are wrong, why are you asking the question?

I'm not neccessarily saying I'm wrong, I'm saying it's already been overrided

Quote from Tana___ >>

For reference: 

Faerie Fire Spell:

Objects in a 20-foot Cube within range are outlined in blue, green, or violet light (your choice). Each creature in the Cube is also outlined if it fails a Dexterity saving throw. For the duration, objects and affected creatures shed Dim Light in a 10-foot radius and can’t benefit from the Invisible condition.

Attack rolls against an affected creature or object have Advantage if the attacker can see it.

Due to the wording of "Affected creature or object have advatage," does that mean, since the creature makes a saving throw, which affects them regardless of what they roll. Does a creature that attacks a different affected creature have advantage even if the affected creature still succeeded on the saving throw?

The creature isn't affected by the spell if it succeeds on the saving throw, so attack rolls against it don't have advantage.

Just having to roll a save doesn't count as being "affected" in this context. If it did, there would be a lot of spells and other effects that would either not work at all or work very differently to how everyone understands that they work.

Why doesn't a save count as affected?

The first sentence of the spell description details the effects on objects within the area. 

The 2nd sentence  says that creatures in the area are also affected IF they fail a saving throw. Meaning that a creature that succeeds its saving throw, then it is not affected.

that is how English works (and I say this respectfully).

Quote from Thyrwyn >>

The first sentence of the spell description details the effects on objects within the area. 

The 2nd sentence  says that creatures in the area are also affected IF they fail a saving throw. Meaning that a creature that succeeds its saving throw, then it is not affected.

that is how English works (and I say this respectfully).

 I'm talking solely about the last sentence, as it is the one that gives the advantage.

Creatures that succeed in their saving throw are not affected by the spell, therefore attacks against them do not have advantage.

Quote from Tana___ >>

Why doesn't a save count as affected?

If it did, that would mean that success or failure on the saving throw has no mechanical impact at all, since all the effects of the spell that actually have a mechanical impact are only applied to "affected creatures" or "objects and affected creatures".

Does it make any sense that a spell would be written to require a saving throw, but for the effects of the spell to be exactly the same whether you succeed or fail?

Quote from Tana___ >>

For reference: 

Faerie Fire Spell:

Objects in a 20-foot Cube within range are outlined in blue, green, or violet light (your choice). Each creature in the Cube is also outlined if it fails a Dexterity saving throw. For the duration, objects and affected creatures shed Dim Light in a 10-foot radius and can’t benefit from the Invisible condition.

Attack rolls against an affected creature or object have Advantage if the attacker can see it.

Due to the wording of "Affected creature or object have advatage," does that mean, since the creature makes a saving throw, which affects them regardless of what they roll. Does a creature that attacks a different affected creature have advantage even if the affected creature still succeeded on the saving throw?

 The problem is, what you are quoting, you are taking out of context by not including the whole sentence. Let's add those words back in but, leave your quote marks.

Attack rolls against an "affected creature or object have Advantage" if the attacker can see it.

Alone, the quotes change the subjects referred to as the creatures and objects. The original text makes it reasonably clear the subjects are attack rolls.

This may be more clarifying:

Casting Spells > Saving Throws

Many spells specify that a target makes a saving throw to avoid some or all of a spell’s effects. The spell specifies the ability that the target uses for the save and what happens on a success or failure. Here’s how to calculate the DC for your spells:

Spell save DC = 8 + your spellcasting ability modifier + your Proficiency Bonus

When a spell specifies a Saving Throw, succeeding on the saving throw avoids the effects of the spell, unless the spell explicitly describes an effect on a successful save.

For example:

• Fireball: "Each creature in a 20-foot-radius Sphere centered on that point makes a Dexterity saving throw, taking 8d6 Fire damage on a failed save or half as much damage on a successful one." Fireball tells you what happens on a failed save and a successful save so a creature is always affected by the spell unless a feature says otherwise.
• Fear: "Each creature in a 30-foot Cone must succeed on a Wisdom saving throw or drop whatever it is holding and have the Frightened condition for the duration." Fear specifies what happens on a failed save but does not mention anything on a successful save so a creature that passes the save is unaffected (no effect = unaffected). 

Now, looking back at Faerie Fire:

Objects in a 20-foot Cube within range are outlined in blue, green, or violet light (your choice). Each creature in the Cube is also outlined if it fails a Dexterity saving throw. For the duration, objects and affected creatures shed Dim Light in a 10-foot radius and can’t benefit from the Invisible condition.

Attack rolls against an affected creature or object have Advantage if the attacker can see it.

We have a failure condition, but no effect on a successful saving throw. No effect means that a creature is not affected. Therefore, on a successful saving throw, the creature does not shed Dim Light in a 10-foot radius, the creature can benefit from the Invisible condition, and attack rolls against it do not have Advantage from the spell (they may have Advantage from other sources, of course).

Does that help?

To me, this doesn't feel different from other discussions in the subforum:

- How does Contagion work? - Rules & Game Mechanics 
- Scarecrow 2024 M - Rules & Game Mechanics 
- What happens on a succesful save against Contagion? - Rules & Game Mechanics 

The same question asked by Tana could be applied to similarly worded spells such as Hypnotic Pattern, but when you read a spell's effect by isolating sentences or paragraphs, instead of using common sense and context, that's when you get weird situations.

EDIT: for clarity.

Quote from Tana___ >>

Why doesn't a save count as affected?

Because that's literally what saving throws are for

Saving Throws

Many spells specify that a target makes a saving throw to avoid some or all of a spell’s effects. The spell specifies the ability that the target uses for the save and what happens on a success or failure.

Quote from ArmorStorm >>

Quote from Tana___ >>

Why doesn't a save count as affected?

 You cannot be serious.  Reducing or avoiding the effect is the entire point of a saving throw!

 That was completely serious. I wanted to see how the community would react to something like this.

No, I also genuinely wanted to know the answer. The aformented reason was a benefit, not the actual reason

Quote from Tana___ >>

No, I also genuinely wanted to know the answer. The aformented reason was a benefit, not the actual reason

 I guess the question is why do you want to know the answer to this. You open with acknowledging this is a bad-faith interpretation, so what's your goal here? Maybe providing that information will temper peoples responses and help them provide more useful answers.