So, a Mimic can mimic inanimate objects through it's Shapechanger trait:

The mimic can use its action to polymorph into an object or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn 't transformed. It reverts to its true form if it dies.

This means that it can't polymorph into creatures, however, a Simulacrum is not a creature, it is an illusion/duplicate.

Has there ever been a final ruling on this?


A simulacrum is a creature and thus cannot be mimicked

You say "a Simulacrum is not a creature" but that is not correct. If you look in the spell description simulacrum says:

You shape an illusory duplicate.... The duplicate is a creature, partially real and formed from ice or snow, and it can take actions and otherwise be affected as a normal creature.

The mimic's Shapechanger trait says:

The mimic can use its action to polymorph into an object...

Creatures are creatures and not objects - they are mutually exclusive.

Since the spell says the duplicate is a creature, a mimic cannot mimic it.

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  • \$\begingroup\$ I believe "Polymorph" is lower case in the original quote. Roll20 just capitalizes random things \$\endgroup\$ – David Coffron Apr 17 '18 at 21:22
  • \$\begingroup\$ @DavidCoffron: you are correct! fixed and thanks. \$\endgroup\$ – Rubiksmoose Apr 17 '18 at 21:24
  • \$\begingroup\$ Thanks.. I'm not at my best today, it seems. Can't believe I read right over that. \$\endgroup\$ – SeraphsWrath Apr 17 '18 at 21:38
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    \$\begingroup\$ @SeraphsWrath: No worries! If you hadn't asked it, someone else eventually would have I'm sure. :) \$\endgroup\$ – Rubiksmoose Apr 17 '18 at 21:39
  • \$\begingroup\$ dndbeyond, even without an account, has more accurate rules text than roll20 in my experience. \$\endgroup\$ – Marq Apr 18 '18 at 5:55

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