The crypt is a low to mid level dungeon on it's first floor, descending into it's depths will bring you to a mid-high dungeon section. It is located in the southwest corner of Serbule in a fenced graveyard.
Placeholder Boss Lower Dungeon
SuperSpider Lower dungeon
Omegaspider Lower Dungeon
Puzzle Room Edit
Here you will have to figure out what order to touch each item on the pedestals.
This will open the chest and give you some items that may or may not be useful.
If you're having trouble solving the puzzle, the solution can be found here: