Talk:Century Dragon/@comment-4592851-20130314011122/@comment-5085186-20130314011700

It's actually just random, and you got lucky! Testing shows the Century is slightly lower chances than Aquamarine (Century 2.5% odds, Aquamarine 3.5% in the cave).

However, in the island, Aquamarine is estimated to go up to 7% while Century (since it's not epic) stays at 2.5%.

So, stick with the cave, maybe!