Just like the original game, monster eggs from Dawn of Fire are distinguishable between each particular species. Since each monster is made up of a certain configuration of elements, eggs from monsters represent the "genetic material" of the two parents. Because the Fire element and Celestials appears in this game, there are a larger variety of different monsters. However, some monsters from the original game do not appear in Dawn of Fire.
Like the original game, most of the eggs are round and oval-shaped.