Originally posted by katsuragi:

How rare are these? Will you get enough Iron to progress if there is only one crypt in your entire world? I've fully searched 7 swamp areas and have not seen one crypt yet. It's a mausoleum looking building with an iron gate for a door, right? Some green torches burning outside? I don't remember them being this hard to find when I played a year ago.

There are 2 types of swamps. Those that do have crypts, and those that don't. Swamps that do have crypts are usually quite big.