Simulacrum + Widogast's Transmogrification

(This is theory-crafting, not for actual use at the table)

The Simulacrum spell creates a copy of the chosen person, including all abilities and creature type (Humanoid in this case), but with additional limitations on healing and imposing the inability to regain spell slots.

Widogast's Transmogrification (L6 Wizard spell posted on twitter by Critical Role) is an irreversible, instantaneous, complete change of the subject to another type of Humanoid.

So, if I were to cast Widogast's Transmogrification on my Simulacrum, effectively turning this snow-man/puppet into a "real boy", it would then fully be a person, not subject to the limitations of the Simulacrum spell, right?  It would have full hit points for its level instead of half of what the person it was a copy of had, be able to regain spell slots and hit points from rests, etc.  As it is no longer a simulacrum, I presume it would have free will, and the creator would have to deal fairly with it to have its cooperation, though as its mind is that of the same person, their goals would be aligned in so far as the plan's not to exploit the former-simulacrum as ("indentured servitude").  And with the transmogrification, the duplicate can have its own appearance, different from the one it was copied from.  And what's more, this new person could gain levels, diverging from the original in spell selection, or even class.

(I put this here because one of the spells I'm asking about is technically homebrew.  Based on the full reading of the spell descriptions, Widogast's Transmogrification is a more complete and permanent transformation than the level 9 True Polymorph, which technically can be dispelled, the difference in spell level being accounted for because True Polymorph allows for a lot more powerful transformation options, like adult dragons)

Unfortunately, Widogast's Transmogrification seems to require that it be cast on a Humanoid. A Simulacrum is a Construct, and therefore not a valid target for it.

However, if you're willing to ignore that restriction, then the rest of what you're saying does make sense as a house rule.

Thanks,

I have the 5e Player's Handbook in front of me, and that line about it being a construct isn't there.  Where/when does that rule change come into play?  I see it in your link to the D&D Beyond entry, but it's not in the physical book I have.

PHB 276: "You shape an illusory duplicate of one beast or humanoid that is within range for the entire casting time of the spell.  The duplicate is a creature, partially real and formed from ice and snow, and it can take actions and otherwise be affected as a normal creature.  It appears to be the same as the original, but it has half the creature's hit point maximum and is formed without any equipment.  Otherwise, the illusion uses all the statistics of the creature it duplicates. ..."

2nd point:  If we went with the later rules that later-added rules about it being a construct, would that then require a True Polymorph to turn the Simulacrum into a Humanoid, and then a Widogast's Transmogrification to change its fundamental nature so it can't be dispelled?  And if that's the case, can True Polymorph be used to turn a Construct into a Humanoid, without changing anything about its class or subclass features?  Or would it have to be a copy of the duplicated person's personality and alignment on whichever humanoid NPC statblock is chosen?

(I'm looking to approach this idea from every angle)

Quote from Obletus >>

Thanks,

I have the 5e Player's Handbook in front of me, and that line about it being a construct isn't there.  Where/when does that rule change come into play?  I see it in your link to the D&D Beyond entry, but it's not in the physical book I have.

PHB 276: "You shape an illusory duplicate of one beast or humanoid that is within range for the entire casting time of the spell.  The duplicate is a creature, partially real and formed from ice and snow, and it can take actions and otherwise be affected as a normal creature.  It appears to be the same as the original, but it has half the creature's hit point maximum and is formed without any equipment.  Otherwise, the illusion uses all the statistics of the creature it duplicates. ..."

 

I was quoting the 5.5e version of Simulacrum, but the 5e version says the same thing, just worded slightly differently, as seen here. This may be an errata change that was added after your print version was published. I don't have a hard copy of the 5e PHB to verify, unfortunately.

Quote from Obletus >>

2nd point:  If we went with the later rules that later-added rules about it being a construct, would that then require a True Polymorph to turn the Simulacrum into a Humanoid, and then a Widogast's Transmogrification to change its fundamental nature so it can't be dispelled?  And if that's the case, can True Polymorph be used to turn a Construct into a Humanoid, without changing anything about its class or subclass features?  Or would it have to be a copy of the duplicated person's personality and alignment on whichever humanoid NPC statblock is chosen?

As written, True Polymorph would remove all the target's class features, because those aren't on the list of things that are retained. However, in principle I don't see any reason you couldn't True Polymorph a Simulacrum into the form of the thing it's originally a Simulacrum of, which would bypass that issue. 

That spell is often used by selecting a specific published monster stat block, but strictly speaking it doesn't have to be used that way, and it does implicitly allow transforming into the form of a player character (by saying that the target form can be something that has a level rather than a CR).

Quote from wagnarokkr >>

Quote from Obletus >>

Thanks,

I have the 5e Player's Handbook in front of me, and that line about it being a construct isn't there.  Where/when does that rule change come into play?  I see it in your link to the D&D Beyond entry, but it's not in the physical book I have.

PHB 276: "You shape an illusory duplicate of one beast or humanoid that is within range for the entire casting time of the spell.  The duplicate is a creature, partially real and formed from ice and snow, and it can take actions and otherwise be affected as a normal creature.  It appears to be the same as the original, but it has half the creature's hit point maximum and is formed without any equipment.  Otherwise, the illusion uses all the statistics of the creature it duplicates. ..."

 

I was quoting the 5.5e version of Simulacrum, but the 5e version says the same thing, just worded slightly differently, as seen here. This may be an errata change that was added after your print version was published. I don't have a hard copy of the 5e PHB to verify, unfortunately.

Quote from Obletus >>

2nd point:  If we went with the later rules that later-added rules about it being a construct, would that then require a True Polymorph to turn the Simulacrum into a Humanoid, and then a Widogast's Transmogrification to change its fundamental nature so it can't be dispelled?  And if that's the case, can True Polymorph be used to turn a Construct into a Humanoid, without changing anything about its class or subclass features?  Or would it have to be a copy of the duplicated person's personality and alignment on whichever humanoid NPC statblock is chosen?

As written, True Polymorph would remove all the target's class features, because those aren't on the list of things that are retained. However, in principle I don't see any reason you couldn't True Polymorph a Simulacrum into the form of the thing it's originally a Simulacrum of, which would bypass that issue. 

That spell is often used by selecting a specific published monster stat block, but strictly speaking it doesn't have to be used that way, and it does implicitly allow transforming into the form of a player character (by saying that the target form can be something that has a level rather than a CR).

 Thanks for the feedback!