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The Darkness spell gives enemies disadvantage when attacking me (as I'd have devils sight), and I can’t be targeted directly with a save spell in the darkness.

The Mirror Image spell gives me a chance of avoiding damage if they do manage to hit me through the disadvantage of not being able to see me.

When I have both running, do I take advantage of the benefits of both? E.g. If an attack manages to hit me, does my mirror image then kick in?

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    \$\begingroup\$ I'm not sure I understand what you're asking. Are you asking if you can cast mirror image and cast darkness with both running simultaneously? \$\endgroup\$
    – NotArch
    Jul 11, 2019 at 0:52
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    \$\begingroup\$ I'm guessing you're wondering whether mirror image still works in darkness? If that's your primary question, you might want to edit the question to emphasize that that's what you're unsure about. \$\endgroup\$
    – V2Blast
    Jul 11, 2019 at 0:56
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    \$\begingroup\$ I think this question asks whether this combo would work: this would make the user 'untouchable'. \$\endgroup\$
    – Vylix
    Jul 11, 2019 at 2:08
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    \$\begingroup\$ @Vylix That's my guess as well. Belfast Biker, could you please clarify in your question whether this is the case, or if you perhaps mean something else? That will certainly help to answer this. :) \$\endgroup\$
    – Vadruk
    Jul 11, 2019 at 7:04

2 Answers 2

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Darkness

The rule on Unseen Attackers and Targets reads:

When you attack a target that you can't see, you have disadvantage on the attack roll.

So this part of Darkness works as you believe. Note, without the Devil's Sight it would be an even roll because they would have advantage attacking a blinded creature.

However, the rule on spell targeting reads:

To target something, you must have a clear path to it, so it can't be behind total cover. If you place an area of effect at a point that you can't see and an obstruction, such as a wall, is between you and that point, the point of origin comes into being on the near side of that obstruction.

So, you aren't correct in assuming you can't be targeted by a spell, as darkness isn't an obstruction, only a visual issue. Spells that say "that you can see" would be stopped by darkness. So, you'd still be able to be the target of save spells. If this weren't the case, blind spellcasters couldn't exist.

Mirror Image

The mirror image spell says:

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.

But it also adds:

A creature is unaffected by this spell if it can't see, if it relies on senses other than sight, such as blindsight, or if it can perceive illusions as false, as with truesight.

The phrase "if it can't see" can be read either "not able to see anything" or "not able to see the target". In this case, the rules are ambiguous, but the lead Game Designer, Jeremy Crawford, tweeted:

An attacker isn't affected by mirror image if it can't see the images. #DnD

At the time, his posts were considered official rulings. Since then, WotC has made it so that only rulings published in the Sage Advice Compendium are considered official. So, it is the designers' intent (Rules as Intended) that darkness or invisibility would make mirror image's effect void. Though as Rules as Written, it seems it might work, if you have a lenient DM.

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    \$\begingroup\$ Nice catch on that tweet. I was sure that this combo would work. \$\endgroup\$
    – Vylix
    Jul 11, 2019 at 2:21
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    \$\begingroup\$ Thanks. It seemed odd to me that blind creatures aren't affected but being blind to the target would -- so I went searching. \$\endgroup\$ Jul 11, 2019 at 2:28
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The Darkness spell gives enemies disadvantage when attacking me

Yes, however, unless you can see in the dark (e.g. Warlock's Devil's Sight Invocation) then you are Blinded which gives enemies advantage to hitting you, cancelling out the disadvantage.

I can’t be targeted directly with a save spell.

Only if the particular spell requires a target "that you can see" - many do but a significant number don't.

The Mirror Image spell gives me a chance of avoiding damage if they do manage to hit me through the disadvantage of not being able to see me.

Except, Mirror Image says:

A creature is unaffected by this spell if it can’t see, if it relies on senses other than sight, such as blindsight, or if it can perceive illusions as false, as with truesight.

If it can't see (because of the Darkness), then Mirror Image doesn't affect it.

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    \$\begingroup\$ In regards to blinded advantage, he mentioned Devils Sight in the title of the question. \$\endgroup\$ Jul 11, 2019 at 2:57

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