Thread:HubToo/@comment-26852710-20151020005603/@comment-25612015-20151020050220

If you can't connect anymore, just delete the region file containing the offending chunk. It will be regenerated like it was originally, without the Gulduril bricks changes. Backup the region files first, to prevent the risk of selection error.

If you can connect, select the offending area and replace Gulduril bricks with something else.