I had a friend make a house mimic in a campaign, was a good time as we slowly figured out the whole house was alive and trying to eat us.

I’m running an Anything goes campaign soon and one of the recurring enemies will be a variation of a steel golem but one of the incarnations is 5 or 6 mimics forming up Voltron style into one enemy.

I was thinking more along the lines of a cure potion

In my own homebrew Sword Coast canon, an entire black market network is run by changelings and their mimic masters. They’re one of the reasons Xanathar is as paranoid as he is, especially after his spies confirmed their successful infiltration of Acq. Inc. at the exec level during a transplanar expedition.

At this point, the party is slipping into eldritch noir levels of conspiracy theories, and trust in reality itself is worth more than gold. 😶