When I play a mimic trap, what happen with the hero on the chest? I Search and find the answer 1 or 2 year ago and I think that the overlord can move the hero on an adjacant free space. If there is no adjacant free space, he can move a figure adjacent to the chest 1 space away and after move the hero that is on the chest on the new free space.

Am I wrong? If no, where is the source?

Hmmm, my mimic card states that the CHEST and not the hero is moved into an adjacent space. The chest then activates as if it were a beastman, and after its activation is complete, the hero resumes his turn. Thus the hero stays exactly where he is, and it is the chest that moves into another space.

The lack of the word "empty" before the phrase "adjacent space" would make me think that the chest is simply placed in a nearby space even if another figure occupies it. But since its movement cannot end there, it would have to move off of it with its activation (possibly after attacking the hero who opened it).

I have always treated the chest as a prop that can end its movement in another space, regardless if a figure is present or not.

I suppose the question of whether or not the mimic can be in the same space as another figure depends on how you interpret the phrase "treat it as a beastman." Specifically, whether or not you think that phrase implies it should also be treated as a figure. Technically you are not instructed to replace the chest with a beastman figure, so it it still a token creature, but one that happens to have all the stats of a beastman. There may be some considerations in the rules for attacking that would require the mimic to be treated as a figure in order to take damage (which it can, since it must be killed to claim the treasure) but frankly our group has never been all that anal about the rules anyway.

If all spaces around the original location were occupied (I don't know that this has happened to us) then we would likely allow the chest to move to an adjacent space and infer that it must end its activation on an empty space. So I suppose we do treat it like a figure now that I sit down and think about it.

That said, the ubermimic (I forget it's name, but it's like a mimic that is treated like an Ogre instead) we always treat as a single space creature due to the whole "it's not a real ogre figure" logic. So our group is a bit inconsistent in this regard.

But if the beastman is treat like a chest and can end it's movement in the same space that an enemy figure, it can attack from the same space?...

I'm not sure of this point. For me the treat it as a beastman say that we have to treat it like if it was a figure... no?

After, my first question still unanswerd. It's impossible to find an answer?

One day, I've read something that says that if the figure can't be move on an adjacent space, the overlord can deplace an adjacent heros figure one space away to make the first move possible (I don't know if you understand my poor english...). If this is not on that point (Mimic) where it is? Moving wall?

Bashwilly said:

Treat the beastman as if it were a figure. Jonny WS's own words betray his error - 'I always treated the chest as a prop...' The card specifically tells you to treat the chest a a beastman, which is a figure.
And attacks cannot be made while occupying the same space as another figure.

Katrigan answered your first question.
Mimic
Pay this card when a hero opens a chest. The chest is alive, and its contents cannot be distributed until it is killed. Move the chest marker to an adjacent space. Treat it as a Beastman and activate it immediately. After its activation, the hero's turn resumes. If the chest is killed, the contents of the chest are immediately distributed.

I was more so just saying that I dont replace the chest with a actual monster figure. I know enough to not attack while in the same space as another figure, or let the heroes stand on the chest and attack it.

Bashwilly said:

I would say no to that idea, regardless of other concerns. There is a rule that says figures cannot attack while in a space with another figure. Whether or not you treat the mimic as a figure, I would say that rule applies. Based on other posts, it would appear that the idea of treating it like a figure is coming out on top anyway. If you do decide to allow the attack, remember that attacks target spaces, not figures, and everything in that single space will take the damage. That's a ruling from Doom that has been supported in Descent with a question regarding using a Guard attack on a monster while it is occupying the same space as another monster. (Hopefully that question is still in the FAQ.)

Bashwilly said:

If a figure is forced to end its move in an illegal space, the OL may move it to the closest legal space of his choice. This covers things like a hero opening a door while standing on another hero (intending to continue moving later) but then he gets caught by Paralysing Gas and is forced to stop. It does not mean the OL can voluntarily move a monster on top of a hero and then forcibly displace the hero to make everything okay (which is what it sounds like you're saying here.)

If you treat the mimic as a figure and observe that all adjacent spaces are occupied by other figures, then you must pick one such space for the mimic to go to. Then from that space you move the mimic to the closest unoccupied space it can legally occupy. You don't move any of the heroes. That's if you choose to treat the mimic as a figure for all purposes. If you choose not to treat it as a figure then it stays underneath the figure you put it under until one or the other moves away. As discussed above, I would still lean away from allowing it to attack from underneath another figure, for simplicity if nothing else.

The crushing wall trap has special rules that allow it to displace figures as it advances (and kill them if they have nowhere to go) but that has nothing to do with mimics or figures in general, that's just the special way crushing walls work.