Can the pocket dimension created by the mirror of life trapping be returned to by using the Gate spelll?

A wizard needs a few decades to think over a problem, and decides to do so in his mirror of life trapping to prevent himself from aging. He packs a bag full of writing supplies and a 5000gp diamond, and has a servant activate the mirror to trap the wizard inside. After a few years have past, the wizard realizes he misses his liquor cabinet, and casts Gate to return to his study. After grabbing a couple bottles and regaining his 9th level spell slot (he took too long and the gate had run its duration), he wishes to return to the mirror. Can the wizard recast gate and step back into the mirror, or must he return to the mirror by his servant reactivating the mirror? Does the extra dimensional cell remain in existence when the wizard leaves it, or collapse until the cell is refilled? What if the wizard leaves his notes, are they ejected when the wizard leaves?

If applicable, what other pocket dimension can or cannot be returned too in this way?

Can the Mirror of Life Trapping force multiple saves?

The Mirror of Life Trapping can trap creatures in it.

Any creature other than you that sees its reflection in the activated mirror while within 30 feet of it must succeed on a DC 15 Charisma saving throw or be trapped, along with anything it is wearing or carrying, in one of the mirror’s twelve extradimensional cells.

Does it force multiple saves? If someone stares at the mirror a remains there looking at themselves for 5 minutes, do they have to save more than once? Or only every time they blink?

What if they look away and look back on the mirror?

Are creatures aware of the effect of Mirror of Life Trapping?

The Mirror of Life Trapping can trap creatures in it.

Any creature other than you that sees its reflection in the activated mirror while within 30 feet of it must succeed on a DC 15 Charisma saving throw or be trapped, along with anything it is wearing or carrying, in one of the mirror’s twelve extradimensional cells.

Does the creature even know it’s making a save for something? If it doesn’t, then it’s likely my players will stand around for a while and I’ll call for multiple saves. Otherwise, they’ll probably look away very quickly.

Can I “High Five” my duplicates from the Mirror Image spell?

The text for Mirror Image says:

the duplicates move with you and mimic your actions […] If an attack hits a duplicate, the duplicate is destroyed.

Does this mean that my warlock can cast Mirror Image, slay an opponent in the first two rounds, then spend the remaining eight rounds giving himself one high five after another? Then wave goodbye to the three images when the spell duration expires normally?

Or does one high five from the caster destroy his own duplicate? One destroyed image with each flat palm slap?

Assume that at the end of round two, no opponent has hit a duplicate, and the three original duplicates are still present when celebratory hand gestures commence.

What is the AC equivalent of mirror image?

It is suggested (by the DMG) to account for defensive options by assuming increased AC, e.g. +2 AC for magic resistance.

I would like to give some of my monsters the spell mirror image as part of a spellcasting / innate spellcasting trait. There is precedence for this: the Alhoon, the Faerie Dragon, and the Lamia have it, for example.

What would be a rough estimate of the AC equivalent for mirror image for the purpose of determining CR / combat performance?

Tangentially related (compares mirror image to other spells for PCs concerning the defensive capabilities): What's my most efficient use of spell slots to help my AC?

What is the percentage of possibly hitting something that has stacked Blur, Blink, Mirror Image, and Armor of Hexes?

This question is mostly for hypothetical fun because setting all of these up isn’t super practical (unless it’s a 1-on-1 campaign perhaps?)

But with all of these stacking, how likely are you to be hit by an enemy? (let’s assume they have Hexblade’s Curse on them for Armor to work)

This probably depends on AC and to-hit from the enemy too, so let’s just take a look at a decent 13 AC, with the enemy having a +7 to-hit. It’s up to you if you add to hit or AC too to really look at how hard it is to hit something with absurd AC + all these defensive buffs, or how much high to-hit really helps.

Are the “power word” spells an attack, and how do they interact with mirror image?

Mirror Image (p260 PHB) 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….

….A duplicate can be destroyed only by an attack that hits it. It ignores all other damage and effects.

Power Word Spells (p266-267 PHB)say:

You utter a word of power that can compel one creature you can see within range…

…Otherwise, the spell has no effect.

I can see this going one of two ways.
Either Mirror image has priority and you roll to see if a reflection is targeted by the Power Word Spell in which case it has no effect.

OR

Power Word has priority and because you see the target even tho there are duplicates, the power word effect takes place and ignores mirror image.

Which is correct?

What’s the point/advantage of a steel mirror?

5e D&D lists a number of mostly mundane items in the PHB on page 150. One of them is a “Mirror, steel” (5gp, 1/2lb). Initially I thought it to be a steel framed mirror, but I think this is actually meant to be a polished (to the point of a reflection) piece of steel.

My question is two-fold:

  • Is this a steel framed mirror or a single piece of polished steel?
  • What’s the idea behind a steel mirror, instead of a glass mirror?

Is it that glass is more expensive and/or too fragile? But 5gp for just a piece of steel feels (relatively) expensive as well. I am aware of the possible idea that it might reflect vampires, but I feel like that may not be the RAI.

Is there a way to get more than 3 mirror images from levels 1-10?

The Mirror Image spell (PHB, p. 260) grants you 3 duplicates. Combining Magical Effects (PHB, p. 205) says casting the same spell multiple times does not combine them.

Is there a low level way (under 10th level) through other class features to get more than just 3 mirror images or clone warriors? I am aware that simulacrum can increase this but I am hoping for something lower level that I somehow missed.