Quote from SpaceCactuss >>

Besides the components, this is a crazy spell. If your in a snowy place, you could literally make anything! Get enough of it, it could become a Tarrasque!

 

 Sadly Tarrasques don’t fall under the creature types you can copy. But there may still be a work around somehow

Counterpoint: the similacrum is described by Crawford as being a “snapshot” of your character with half HP. So it’s missing the slot you used to cast it, but more importantly, it’s current status is “has a duplicate of itself created.” As soon as it casts this, it destroys itself. What this does do is let you create a similacrum with all its spell slots. But just the one. And you just spent quite a bit of time to get that one 7th/9th level back

Quote from ImNotAThief >>

 Sadly Tarrasques don’t fall under the creature types you can copy. But there may still be a work around somehow

 True polymorph the tarrasque into a beast or humanoid. Maintain concentration for full length of spell. Similacrum this creature. Dispel creatures. Two Tarrasques! 

you would still need to make a check to dispel it though and it could cast counterspell.

So, the wizard rests after his cast.  The simulacrum uses its 8th level slot to copy the wizard.  The new one has all slots. You could even make another by expending the first one’s 9th level slot. Then, using the second copy’s slots, make 3 more fully stocked simulacrum.

Lol this comment section is amazing

the target has to be a beast or a humanoid and the tarrasque is a monstrosity

Tarrasque is not a beast tho

(Ignore this - some network error caused multiple postings)

(Ignore this - some network error caused multiple postings)

Sooooo... Simulacrums don't recover spell slots but do recover class feature uses like maneuver dice,  bardic inspiration, etc., correct? Well, Mystic Arcanum is a class feature that doesn't use spell slots and the Genie warlock has Wish as one of its Mystic Arcanum spell options...

How much damage is Eldritch Blast by a 17th level caster times infinity?

Why wouldn't you have each simulacrum make a new copy of you?  You can't make another copy of you, lest the first copy would be destroyed.  But there's nothing in the rules about your simulacrum not being able to make another simulacrum of you directly.  YOU just can't cast the spell again without destroying the first simulacrum.  Doing it this way keeps all of the simulacrums with 62 HP.

Morns the death of its creator?  Other than that nothing.  The duration is "until dispelled".  It's not a concentration spell so it doesn't end when the caster dies.  

Quote from SapphireUmbra >>

To be fair, the simulacrums could just use a second 7th level slot to cast Simulacrum on the original wizard instead of a 9th.

The spell prevents them from regaining spell slots; that does not mean they cannot cast the same spell using a different spell slot. 

 But remember, unless you cast Simualcrum through Wish, your copies will have to provide the 1500gp worth of material components and wait 12 hours for each casting.

Quote from HighVolTech >>

This feels more like a transmutation spell, rather than an illusion.

 It's an illusion spell because you imbue snow with a mimicry of life, so an illusion of life. But I agree, it doesn't feel very natural for it to be in the school of illusion.

Here's my way to abuse it:

1. Cast Simulacrum normally.

2. Take a long rest, recovering all of your spell slots.

3. Have your newest simulacrum make a simulacrum of yourself through Wish to avoid 1500gp material components and 12 hours of casting time.

4. Repeat for as long as you like.

If you just let you wizard army grow, you'd get a new simulacrum every 6 seconds, assuming the new copy takes an action to cast Wish on its next turn in initiative. That would give you an impressive rate of growth of 14400 copies per day.

However, if for whatever reasons you still want more, here's a way to improve it:

4. Instead of repeating the process, after letting your simulacrum make at least one copy, cast Simulacrum again. Your original copy will disappear, but the production chain in form of its successor won't be affected. By casting the spell again, you'll create a new production chain. Repeat it as many times as you like to create multiple chains working at the same time. You'll need to spend the 1500gp to create each chain, but if money is a problem, here's a solution.

Have the newest copy from a chain cast Wish to create 25000gp worth of ruby dust, using one of the spell's example uses. It'll end a chain or force your copy to cast Simulacrum normally (the copy it makes will be able to cast Wish, however), but  since you've just made enough ruby dust to maintain the chain AND create 15 new ones, you'll make up for it easily.

You might notice that it opens up a new, potentially much more powerful abuse - "wait, does that mean I can have my copies cast Wish as many times as I want, for no other price than ending/temporarily pausing a chain, allowing me to experiment with wishes to do such things as wishing for a feat or an eldritch invocation?" Yeah, like hell it does.

Since it basically gives you infinite wishes, you don't need to hesitate before spending them on avoiding time warps after Summer vacations in Feywild, getting every single feat, eldritch invocation, damage resistance, class feature and homebrew feature there is, one by one. You can also get creative, like you're supposed to be when casting Wish, and do things like creating permanent telepathic links with your party, joining your demiplanes created with the spell Demiplane to get a big, extraplanar lair, or getting legendary actions.

I hope my advice helped someone derail and obliterate his or her campaign.

By the way, I have 2 questions: do simulacrums need to eat and can they cast Magic Jar?

Quote from Melphast >>

So, the wizard rests after his cast.  The simulacrum uses its 8th level slot to copy the wizard.  The new one has all slots. You could even make another by expending the first one’s 9th level slot. Then, using the second copy’s slots, make 3 more fully stocked simulacrum.

 "If you cast this spell again, any duplicate you created with this spell is instantly destroyed." This also applies to simulacrums casting Simulacrum, so nope. But there are other ways to abuse it even more effectively.

Then it becomes the Prime and starts calling the shots. No longer does it follow commands but instead issues commands. 

The Simulacrum will attempt to resurrect its creator, success in that regard may vary if the simulacrum is of someone who can’t bring back the dead. 

You need the first part of the spell again. The creature must be present the entire 12 hours. 

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