From publisher blurb:
You have, in this installment, two packets worth of mimic mischief, intended to be used in all variety of tabletop settings, from medieval to modern and beyond. Each entry has a 5e-compatible stat block with unique monster mechanics, two descriptions (for when the mimic is concealed and for when it reveals itself), alternate locations the mimic can be found, ways to alter a mimic to suit your game’s time period, and (most importantly) a unique pun, to give each entry a little more flavor.
Product contains sharp teeth, lashing tongues, acid drool, and a kitchen and tavern full of hungry mimics.
Warning! Encounters with mimics are often startling for the players and sometimes gruesome or frightening. The Mimicnomicon Team recommends verifying the use of particularly nasty mimics with your table ahead of time before bringing it into your games. We want our mimics to show you a good time, and sometimes that means cluing your players into the potential for a jump scare before it happens.