Clone requires that your soul transfer to the inert clone upon your death. It doesn't seem reasonable to say that your soul could divide itself among multiple bodies.
You can't use contingency with wish. Contingency can only be used with spells of 5th level and lower.
On the other hand, just make it so. If you're the DM and you want this to happen, then it happens. The PCs don't need to learn how it happened. Let it forever be a mystery.
True... but some "rules-lawyers" get upset if they don't figure stuff out.
I was trying to make it as believable as possible or find a mechanic where it would be close enough to avoid questions.
1. My necromancer villain can be a CR 23. With a Boon that grants another 9th level spell.(this group of 5 can handle it easil with 20 years of playing)
2. He could have lived years developing his evil plan.
3. He hard casts Simulacrum. Then takes a long rest.
4. The Simulacrum (Disposable #1) has 2 9th level spells. And thus casts Wish for a copy of the Simulacrum spell and copies the villain (Which has all his spells, Disposable #2) and the other Wish for 25k and has a chance to not be able to cast Wish again. But who cares, he won't be around for worry about it. And he's out of 9th level spells.
5. The Simulacrum(Disposable #1) hard casts another Simulacrum spell targeting the villain. (This NEW Simulacrum has all the villains spells, and is Disposable #3). Now there are 2 copies (Disposable #2 & Disposable #3), but Disposable #1 is running low on spells, and casts as many clone spells as he can on the villain.
6. The Villain tells Disposable #1 simulacrum to tell his 2 Simulacrum to obey all your commands. Then Disposable #1 casts whatever spells he can that would be useful.
*this is where the balance of Clone and True Polymorph come into play.
7. The Villain then hard casts and starts the process all over.
So, that was 2 days in the life of a villain.
Aging what he can do over the course of years.
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