Entering the maze:
-You're stripped of your gear, accessories, assists, summons and items when you enter. There's one exception to this, which I'll mention at the end
-You start the labyrinth alone, although you can find friendly characters inside
-You can choose to start from any control point in the labyrinth if you have ever reached the room housing said control point
Playing through the Labyrinth:
-The Labyrinth is made up of a lot of rooms that are connected. These rooms are grouped in Cloisters. Generally the control points are in the rooms that mark the start of a Cloister
-The layout of each room is like the Colisseum's: you have random cards that you choose from. They can be battles against other characters (single or in parties), job/effect cards, items (weapons, armor and crafting items), party members (which can either join the party or become assists), accesories, etc
-The Cloister dictactes the kind of cards you'll get. In the Cloister of Jobs, for example, you get a lot of job cards
-Generally (in like 90% of the cases) gear, accessories, summons and assists you get while in the Labyrinth are lost when you exit the labyrinth. You can't carry them over to the other game modes. More on this later.
-You can access a Labyrinth shop while in the Labyrinth, from the shop menu. This allows you to craft several exclusive items (more on this later) by using the items and drops that you have gotten in the labyrinth (and only in the labyrinth)
-The labyrinth has a few official exit points, called Goals
Exiting the Labyrinth
-You "finish" either by hitting Exit at any time (like in the Colisseum), by reaching one of the Goals I mentioned, or by having all your characters KOd
---By leaving through a Goal, you can set a cottage in the labyrinth. The cottage keeps inside all the items you gathered while in the maze and it is randomly placed in any of the labyrinth's rooms you've explored. If you reach that room again in a future run, you can reobtain the items you had when you set up the cottage if you pick up the Cottage card that will appear
---By clicking on Exit, you can set up a tent in the room you're exiting from. If you reach this room in a future run, you'll re-obtain all the items you had when you set up the tent if you pick up the Tent card that will appear
----You can only have one tent and one cottage at all times. Setting up a second tent will overwrite the first tent (and destroy the items inside). Likewise with the second cottage and the items in the first cottage
---If your entire party gets KO'd, you get a Game Over screen and lose everything you had in that labyrinth run. Have to reenter (either through the beginning or a control point)
On Special Items
-I said generally you can't take items from the labyrinth outside. There's an exception: items with a cottage icon. You can take these items outside of the labyrinth if you either reach a Goal or pick Exit after using a Geomancer job card (which lets you take these special items outside while the card is in effect)
-You can take these items into the labyrinth too. When you enter the labyrinth, you can choose to do so with your special items equipped. However, keep in mind these items become bound to the same rules as when they were first found in the labyrinth. This means you'll only be able to take them outside again if you follow either of the methods above to leave (Exit with Geomancer or reach a Goal).
-Most of these items are crafted from the in-labyrinth shop. The easy ones usually have two components: one is a battlegen item (that you'll generate while fighting enemies in the labyrinth) and the second one is a special item that you'll get as a card in some rooms