- Could this be used before invisibility, would the mirages go invisible. and / or would i be able to leave the area while they distract the area? - 

not possible at all. smh they are images, not real copies of you. they look like they are casting the fireball but nothing actually happens on their end. they are copying you to make it harder for anyone looking to know which of you cast the fireball but that's it. They are illusions.

You know... a player casting eldritch blast at eleventh level would destroy all the duplicates...

Good defensive spell that is not concentration. 

Does Area of Effect damage harm an image?  Rule: "A duplicate can be destroyed only by an attack that hits it.  It ignores all other damage and effects."   This appears to mean that because a dragon's breath or a fireball spell is an area of effect spell and does not use a to hit roll, the images ignore all damage and effects.   This makes sense because an image cannot suffer damage unless it is actually targeted with an attack that requires a to hit roll.  

Quote from Weisman >>

Quote from Drenix >>

"Each time a creature targets you with an attack during the spell's duration, roll a d20 to determine whether the attack instead targets one of your duplicates."

Does it mean I have to do it before I know the attack roll? Or can I decide after, if I see I woule actually be hit?

 

So the way this works is that when the enemy declares you as the target for an attack, you roll a d20 to determine if the attack is at you or one of your duplicates. Once determined who the attack is hitting then the attack roll would be contested by your AC or your duplicates. With the phrasing "Each time a creature targets you with an attack" means that any attack targeting you is subject to the spell. This is ultimately the magic shell game once you cast it your mixed up with your duplicates and the d20 roll is whether or not the attack got the right one.

TL;DR: Yes you have to roll it as soon as they target you to see who the attack is going to actually target you/duplicates.

 Doing Tyranny of Dragons rn with my multiclass fighter and warlock. Casted this before Tiamat did the red breath weapon. Hit my duplicate and did no damage to me. Just wondering, did my DM do this right? 'Cuz it says that "

Each time a creature targets you with an attack during the spell's duration, roll a d20 to determine whether the attack instead targets one of your duplicates. If you have three duplicates, you must roll a 6 or higher to change the attack's target to a duplicate." I rolled an 18 with three duplicates, my DM said that since the target changed from me to the duplicate, I took no damage. Everyone else at the table was shocked at how my character survived a breath weapon from Tiamat herself. Thoughts?

When i am forced to make a saving throw, do i count as being targeted by an attack? 

Comical verbal component: "Can your friend do this, can your friend do that"?

Emo verbal component: a cut down version of "It is purpose that created us, purpose that connects us, purpose that pulls us, that guides us, that drives us; it is purpose that defines, purpose that binds us".

shadow clone jutsu?

A bit late with the response, but spells that cause you to make a saving throw are not attacks due to the fact that there is no attack roll. You most likely won't find the word 'attack' in the spell description. So if you fail the saving throw the effect should effect you.

When you cast this would your images also deal damage if you attacked an enemy or just one hit?

Quote from Aeriyck >>

When you cast this would your images also deal damage if you attacked an enemy or just one hit?

No, the duplicates are illusions - they aren't real creatures and can't do anything. If they could, the spell description would say so.

I agree with your DM. Since they are illusions and they can't interact with the environment, don't take up space, and wouldn't make vibrations (but you still would), so the creature would be able to discern which are illusions and which are not.

Is it fair to say the spell description supports anyone using the Blind Fighting fighting style not being affected by this spell as long as they keep their eyes closed and don't rely on their sight?

My knee-jerk decision is "yes" but I wanted to see if anyone has a logical argument against that decision. If the answer IS actually "yes", then does the unseeing opponent also lose their ability to get Dex saves against any hostile spells that allow for such because they can't see the spell(s) attacking them?

Quote from Daefaroth >>

Is it fair to say the spell description supports anyone using the Blind Fighting fighting style not being affected by this spell as long as they keep their eyes closed and don't rely on their sight?

My knee-jerk decision is "yes" but I wanted to see if anyone has a logical argument against that decision. If the answer IS actually "yes", then does the unseeing opponent also lose their ability to get Dex saves against any hostile spells that allow for such because they can't see the spell(s) attacking them?

You do not have to keep your eyes closed to use blindsight.