Donor Dungeon
To enter the Donator Dungeon, first teleport to the Donor Zone with ::dz or ::di. You'll find the trapdoor to the south-east. Upon attempting to enter, you will get a pop-up asking if you would like the mobs to be aggressive or not.
Once inside, you'll find Nieve, the bank chest and an ornate pool.
If you try to attack any monster when not assigned them as a task, Nieve will stop you and inform you that you may only attack monster when on task in the dungeon.
If you try to enter a zone you do not have the proper rank to access, you will receive a message telling you what rank is required to access that zone.
You can see the map of the dungeon as well as the ranks required below.