Originally posted by Rhapsody:

I don't know about crypt variants, but they did reduce density of crypts a long time ago (two years or something). If you used to play on an old world seed, you may have ran into swamps containing crypts as close to each other as is physically possible, 30-50m between each. The change made was semi-retroactive since it prevented spawning of new "extra" crypts even on those old seeds/worlds.

We've played a lot more recently than that and while I can't say that the swamp crypts were as dense as you mentioned here, they were a lot more plentiful than the ridiculous scarcity we're dealing with now.

We've actually decided to just spawn in some chests worth of iron at this point. It's simply not fun to deal with the crypt search with how scarce they are now (especially as I get sea sick from sailing, so exploring is a bit difficult). It's not like we haven't done the swamp song and dance in the past anyway.