Yes, please. Toss in concept art and everything. That is the only way to ensure that your vision will never, ever come to pass in this game.

Players don't get that if SE ever uses anything you all come up with in-game, specifically the way you describe it, they open the company to legal charges. Which is something they cannot do. Ever.

There will never be a dungeon with this name, nor bosses with those names, nor bosses with actions listed in this game. It's one of the major reasons that song writers don't listen to/or watch fan submissions. It's one of the major reasons that authors don't seek out fan fiction based on their works.

Your concept could be cool, and interesting. Just don't ever expect a developer to actually read the post, lest it put the company in legal jeopardy at some time in the future.