Talk:Peridot Dragon/@comment-76.219.201.68-20120801171934

Since its unlocked at level 17, it has to have metal in it. Following the pattern that all gem stone dragons have 4 different elements, none of which are opposite, this dragon can't have plant in it. This still leaves many possible choices, but it helps a lot too.

Metal Fire/cold Air/earth Water/lightning

The dragon is going to have 1 (and only 1) element from each row. That leaves 8 possible element combinations. Then it get more complicated based on which dragons make up those 4 elements (difference between scorch and fog vs iron and blazing. Same 4 elements, different dragons). The maximum number of these combinations is 24 ( this number becomes less if a pair of elements only has one corresponding dragon. Fog dragon is water and air. No other dragon has just water and air). This eventually comes down to a maximum possible combinations of 192.

This number still seems high, but if these rules weren't known, there'd be many more combos. Estimating that there's 60 dragons (which can breed) in the game, there are over 3500 combinations if you didn't take the above rules into account.