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The situation is this:

A Genie Warlock comes up with an elaborate scheme relying on multiple uses of his Mystic Arcanum; Wish. They know that this can be only cast once a day, but the wizard gave them a hint that just might double their efforts... Wishing for a simulacrum!!!

The simulacrum spell states: (emphasis my own)

The simulacrum lacks the ability to learn or become more powerful, so it never increases its level or other abilities, nor can it regain expended spell slots.

While the Mystic Arcanum states: (emphasis my own)

You can cast your arcanum spell once without expending a spell slot. You must finish a long rest before you can do so again.

And, for lesser wishes, the Limited Wish feature states: (emphasis my own)

You entreat your patron to grant you a small wish. As an action, you can speak your desire to your Genie's Vessel, requesting the effect of one spell that is 6th level or lower and has a casting time of 1 action. The spell can be from any class's spell list, and you don't need to meet the requirements in that spell, including costly components; the spell simply takes effect as part of this action.

Once you use this feature, you can't use it again until you finish 1d4 long rests.

Does this mean that the Simulacrum will also regain the use of Limited Wish and the Mystic Arcanum as well, given that they don't require spell slots? If so, what is to stop a Simulacrum from wishing for a simulacrum?

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  • \$\begingroup\$ My biggest confusion here is how game-breaking this might be. While you cannot raise an army of simulacrum on your own, if it gains the ability of the Wish spell, it could create a simulacrum of half its HP, which then creates a simulacrum of half its HP continuing til you have one simulacrum with 1hp... A lvl 17 Warlock with the very basic level boosts would have 88HP, and thus could have access to 7 daily Wish spells in 6 days. \$\endgroup\$
    – Victor B
    Jan 10 at 7:34

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As written, a warlock's simulacrum regains their Mystic Arcanum spells each day.

As you have observed, the text of simulacrum is quite specific:

The simulacrum lacks the ability to learn or become more powerful, so it never increases its level or other abilities, nor can it regain expended spell slots.

Mystic Arcanum is just a class feature, it does not use spell slots, so as written, nothing seems to prevent a warlock simulacrum from regaining use of their Mystic Arcanum spells each day.

That said, it seems perfectly reasonable to rule that Mystic Arcana do not recharge, just as spell slots do not recharge. If you intend to rule this way, this is something you should discuss with your warlock early, so that they do not make any build decisions based on the assumption that a simulacrum will be able to recharge Mystic Arcana.

An army of simulacra is not a new exploit.

The accepted answer to this question outlines how an army of simulacra can be created by any character with wish and simulacrum. Ladifas writes:

This problem is easily circumvented once you have access to wish:

  1. Cast Simulacrum to create an exact copy of yourself (minus one 7th level spell slot).
  2. Tell Simulacrum-1 (Sim-1) to cast wish to make a simulacrum of you (does not require materials). Sim-2 has been created.
  3. Tell Sim-2 to cast wish to make a simulacrum of you (creating Sim-3).
  4. Repeat until you have the desired number of simulacra.

The simulacra all have half your hp, and are missing one 7th Level spell slot (and one 9th level spell slot once they have cast wish).

This can be used as many times as you like (/can be bothered with, as each casting of wish requires an explicit command). Also, the simulacra cannot act independently; they require orders for every action, which can become tiresome once you have too many. Also, they can be got rid of with dispel magic.

Keep those limitations in mind, and you should be able to take over the world with a simulacrum army (assuming your DM doesn't ban the whole thing once he cottons on to what you're doing - I certainly would).

Note: This strategy is explicitly disallowed by the Adventurers League FAQ Version 6.1, which states: "Simulacrums can’t cast simulacrum, or any spell that duplicates its effects."

And yes, it is game breaking, which is why, as Ladifas notes above, it is outright banned in Adventurer's League play.

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  • \$\begingroup\$ I must have misunderstood the spell, as I thought creating the second simulacrum of yourself (even by a simulacrum) would make the first one vanish. However, this would be interesting as you could have an army of simulacrum in a day (as they make copies of you never having cast Wish, then using it to cast Wish.... \$\endgroup\$
    – Victor B
    Jan 11 at 0:37

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