I want a pet mimic so Ima try and train one wish me luck community 

I hate the fact that it is neutral, my party pacified one and I am depressed.

It doesn’t give any size restrictions to It’s polymorph, so could it turn into a huge object like a house?

Quote from LunarSilveraxe >>

It doesn’t give any size restrictions to It’s polymorph, so could it turn into a huge object like a house?

 I think because it says that it's stats don't change that means it can't change size.

hehe mimic mountain

cake mimic.

lol

Quote from Eravanfeighn >>

DM: a single skeleton enters the hallway, walking towards you with an uneven gait.

PLAYER AT LEVEL 20: one skeleton? We’re level 20! Stop giving us level 1 threats!

DM: actually, as it nears you, you see that each bone has two eyes and a mouth, and you discover that every bone in the skeleton’s body is a mimic. Now, please roll initiative against 206 mimics!

PLAYER: RUN!!!

 So, I just checked, and 206 mimics is considered deadly for anything less than twenty-two level twenty players. For comparison, two Tarrasques is a deadly encounter for twenty-four or less level twenty players.

why wouldn't it, they polymorth into them

so what would the average lifespan be for a mimic? My DM is letting me have a mimic as my character, and I need to know.

I came here to read this after my dad told me that his group uses mimics like what Dark Souls uses. 

All I can say is that I'm thankful mimics in Dark Souls are just chests and that they can't take the form of a door.

you monster

I tamed one as a druid and it was so cool because the possibility of having living objects is endless. example a self driving carriage. a sword with tentacles to pull in your enemy's. mimic arrow to wrap you enemy on hit. mimic cape to rip of doctor strange and many more awesome things. if your a dm give a player one of these and make the combat a bit harder until the players hit lv 5.

I made the mimic a spoon, next to a plate, in a room with a chest, the chest key and candles, my party struggled and schemed on how to kill the mimic chest but their efforts was useless as the spoon revealed itself as the mimic and attacked a party member 

Can a mimic look like a plant or fungus?

Just made an intelligent mimic that looks like a cave that has a prisoner inside and uses psionics to control skeletons to herd the players inside.

The Thing...

Quote from StonedWonder >>

I made the mimic a spoon, next to a plate, in a room with a chest, the chest key and candles, my party struggled and schemed on how to kill the mimic chest but their efforts was useless as the spoon revealed itself as the mimic and attacked a party member 

 this, this is amazing.  your enginuity is brilliant and i have a similar idea.

"your in the treasure room, sand falling from the hole in the rock ceiling down to the floor. a treasure chest lays infront of you."

in the event players think the chest's the mimic

"suddenly from the sand, a mimic rises!" 

if your players are annoying, use a sand mimic

Shapechanger. The mimic can use its action to polymorph into an object or back into its true, amorphous form. In other words, a shapeless mass, like a slime.

LOL, the first DND game I played with was with a group inexperienced players and an experienced DM and he had us running through the Underdark. Being the smart people we were, we split up to search 4 empty rooms. I was tasked to search a room with a fountain. As I searched the room, I decided to search the fountain. In the bottom of the fountain was the wonderful glowing sword and I just reached out and grabbed it and was instantly grappled by the Mimic. Needless to say, being low level and by myself I didn't survive the encounter. I learned to valuable lessons that day:

1. Don't split the party. By the time they anyone got to into the room with me, I was nearly dead and it still took them another turn just to get to me. 

2. Be careful what you grab for.

lol

I don't blame the DM, he was just teaching us a lesson and helping us understand the game better. He had other traps for the other players, I was just the lucky one to find mine first. This wasn't the first time we split the party and randomly started grabbing things.