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Something very weird happened last Sunday night in my Tier 4 gaming session : a player had a simulacrum that was True Polymorphed (into a Red Abishai) for more than an hour (became "permanent"). A foe casted Dispel Magic at 3rd level on the True Polymorphed Simulacrum, and succeeded the DC17 check for Simulacrum, but failed the DC19 check for True Polymorph.

I ruled that it became an actual, real, independent (free-will) creature (here, a Red Abishai), but I'm not sure if that was correct.

What happens when a True Polymorphed Simulacrum is affected by Dispel magic, but only the Simulacrum spell is dispelled ?

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The creature "dies" when Simulacrum ends

True Polymorph lists many things in its spell description, but one thing it does not mention is magical effects. Casting True Polymorph on a target does not end or alter any other magical effects that were already affecting that target.

In this case, Simulacrum is an active magical effect on our True Polymorph target. And again, since True Polymorph doesn't say it alters any magical effects, it doesn't. So, our target is now affected by both Simulacrum and True Polymorph, and is beholden to the conditions of both spells.

Simulacrum lasts until dispelled, at which point the effect ends, and the entirety of the creature "dies" and becomes ice and snow once more.

We can see a similar application of this logic if we were to True Polymorph a summoned creature. Summoned creatures are still bound by the rules of their summon, so even if we've cast True Polymorph on them, they still disappear when the duration of their summon ends.

But True Polymorph can target objects!

We potentially run into a gray area when we consider True Polymorph's targeting capability: True Polymorph can target an object or a creature. When Simulacrum ends, our creature becomes an object (or a pile of objects, depending on how we look at it). One might argue that True Polymorph doesn't end when Simulacrum does since, as an object, the target of the spell is still valid under True Polymorph's description. However, we should consider that we chose our target for True Polymorph when we cast the spell, and True Polymorph doesn't check for new targets at any point in its duration. This DM interprets that to mean we would need to re-cast True Polymorph on a new target (the object, or something else) if we wanted another Red Abishai around.

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Simulacrum lists the duration as "Until Dispelled".

If Dispel Magic succeeds the spell would end and the creature should be dispelled.

Consider a later Dispel Magic that ends the True Polymorph, what would the creature revert to?

Ruling that the creature remains until True Polymorph is dispelled doesn't seem like a big stretch, but I can't find support for the creature becoming real.

On the other hand, the DM always has the final say.

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