So, my idea for this is that there could be loot drops or some sort of resource similar to the crystals that could be harvested for the guild that would allow the guild to craft dungeon tiles, enemies, ect. All of the stuff would have a unique look to it as it is crafted by the knights and they would have their own crafting design as apposed to the creatures that crafted the entire world. This would allow a guild to craft a solo dungeon of some sort that they could use. The number of dungeons or size of the dungeon they would have access to would be something that would have to be paid for with in game currency (Trying to keep this concept friendly to ftp players). The cost for this would be relatively high mostly because having a guild that has a personal dungeon would kind of be a big deal. This would allow the players to visit dungeons crafted by other guilds to play through them and rate the quality of the dungeon. These dungeons wouldn't drop any loot though as they are made by the player base (would be bad to have a long hallway loaded with enemies for the sole purpose of speed farming the coin needed to purchase the next dungeon slot).

"Why would you want to make a dungeon crafted by the players that doesn't drop anything though?"

Practice, experience, competition, chance to be added into the game by the developers as a new level somewhere in the clockworks, ect. The dungeon could also be crafted for pvp purposes as well or some sort of mini game if the right tools were added in.

"How would you have an entire guild go about crafting a single dungeon with limited resources?"

A question that requires multiple answers. First, how would you handle the building of said dungeon?
Pull Rank - Guild master would have primary authority. A good guild master will be able to balance how everyone works on the project. For example, they could assign some of the officers of the guild with building permissions and then assign some of the other members of the guild with the permission to view the project and provide input in some way (Ghost blocks and items that would be illusionary and of the color of the night placing them. This would allow players in control of the project to still work with the rest of the guild to craft the project as it is being formed without having everyone in the guild all jump into a single dungeon in creation and place blocks, items, tiles, ect wherever they want causing mass chaos.

The second way to have the entire guild work on crafting a dungeon has to deal with sharing ideas. For this, I suggest 2 things. First is a new crafting station I would call Map Making and the second being a Library. A functioning Library. I emphasize this because I haven't really found a game that actually has a library that isn't just for show in some way. With the Map Making Desk, or Drawing Board, a player would have the ability to work on what would appear to be a sheet of paper or hologram to craft a project. This would let them create a template that would allow them to get their ideas printed for others to see and a library to store said ideas. I would also suggest a larger version of the Drawing board intended more for multi-person viewing. This ties back into the Pulling Rank concept. If people have an idea they can present the drawing to the guild leader or one of the officers and then the officer could plug that design into the Large Drawing Board (LDB) and it would automatically pull up the design on a platform they could view and work with. Everyone else would be able to observe and would have access to a pointer. For this I would limit how much extra tools the players viewing would have because it is basically working off of a 2D space so it would get really cluttered really fast. I would also allow the officer in control of the drawing to have multiple copies of drawings laid out. I'm going to expand on this concept real quick.

Basically the officer would plug in the Original Drawing into the LDB, this would create a digital copy of the drawing while leaving the actual drawing on the desk near the officer's character as he works. You would almost need a first person perspective for this. When your working on the copy, you shift into an over head view. when you want to take a look at the original, you would pull back to the characters perspective and look to the side slightly to look at the actual drawing. Doing this, the Officer working on this copied version of the drawing could actually have multiple copies. Done correctly, He could input all the copies, then position them in the new drawing on the LDB as he works them and keep referencing back to the original sheets as he makes changes. Access to this LDB I feel should be restricted to those with the authority to use it while the smaller drawing board would be free to use by any guild member so long as there is paper and/or resources to use it (Or if its a didgital drawing board concept make the resources cheap, Store everything on the Spiral Cloud). It will give more value to the LDB. I don't see why it would be a problem to have it set up so that multiple officers could use it at once and then just let others join that officers version of the drawing to provide input though.

The Idea could most certainly use some work, but I don't really see why a dungeon crater for the player base hasn't been implemented yet. It would make an easy way for groups of people within the game to work with the developers on creating new content.

Developers - "Ok guys, we are looking to create an expansion that has to deal with a void aspect of the game where creatures from an alternate dimension of Cradle have gained access to certain levels and are attempting to take over. Something dark cosmic themed. We may even add in an additional enemy group of the corruption side that is in conflict with the dark cosmic and they are invading this space of reality as well to try and fight off the dark cosmic and gain a foothold on Cradle first and take over. A kind of Civil war between two factions that has flooded over into this reality and the knights of the Skylark have to fight them off since they are stuck on cradle and are calling it home now. We need some Ideas for new dungeons. Get to work. :)"

^ Something like this basically ^
I'm open to ideas on how else this could be worked with or altered to make it work. Maybe crafting of unique special enemies that the knights originally used for training, test training of new tech and equipment (A new companion concept, unique weapons crafting to add to enemies, unique powerful enemies only found in custom crafted dungeons) multilevel floors (Holes that drop down or elevators that take you up a level within a certain floor), puzzle making that involves more then just hitting the problem till it breaks, ect.