Board Thread:General Discussion/@comment-26273552-20170710103907/@comment-25218347-20170723220145

well, only the elders are immoble. anybody who has gone through the "treeification" process is considered an elder, and treeification takes a long ass time.

basically, it takes a long time for ribarks to become fully immobile, which is a reason why there aren't many elders around.