User blog comment:Sasha Dawg/That's Strange... Is This a Glitch?/@comment-71.203.34.173-20120726231419

If there is 500 ebonstone all within a small area/close together, you'll create a miniature corrupt biome. It can be troublesome, especially after you beat the WoF. I suggest removing it and replacing it with something else, something easy to collect (like dirt or stone)