You get a lava or a earth dragon
I got a mountain dragon.
There are a few possibilities. Those are Scorch, Firefly, or Lava.
You can get any of the following dragons, Scorch, Firefly, Quake, Obsidian, Lava, and Crystal.
I tried 5 times and I got this.(in order) Lava Flower Flower Tree Lava
Possible results of fire + obsidian:LavaObsidianEmeraldCactusMotleyTreeAirSparkPoisonAbyssDouble Rainbow Dragon
Cold and lava in the epic breeding island
Three of the possibilities are tree dragon, poison dragon, or lava dragon.
Flower dragon
You can get any of the following dragons, Mud, Obsidian, Ice, Iceberg, Snow, Rain, Blazing, Fog, Salamander, Lava, Glacier, Coral, River, Mountain, Smoke, Rainbow, And Double Rainbow Dragons
The result of breeding an blazing dragon and crystal dragon has 9 possible dragons you may breed which is the firefly dragon, scorch dragon, quake dragon, blazing dragon, sonic dragon, lava dragon, solstice dragon, crystal dragon, and rainbow dragon.
You will most likely get a Firefly or Scorch. It depends on what dragon is left and what dragon is right. Lightning (left) Lava (right). That = Firefly Fire (left) Lightning (right). That = Scorch