Talk:Opal Dragon/@comment-94.6.223.139-20121002182030/@comment-5098300-20121002183651

I'm guessing that before they posted the combo, the Wiki researchers tried every conceivable combination. If Bone and Mud would work, they would have posted the combo as "Lava or Bone with Mud" but they didn't. So even though Bone has the same elements, I think that you would do better to breed only Lava and Mud. It seems that for Gemstone dragons, Bfs has made the required combinations very specific.