Talk:Life Crystal/@comment-92.18.209.82-20111213142414/@comment-4658608-20111213143530

They appear in the Underground Hallow, after killing WoF. It seems that when you find where they spawn, there's literally about a dozen on my screen anywhere in the Underground Hallow.

If you haven't killed Wall of Flesh, they won't appear. If you have, you're probably not in the right biome.