Ragnar your roll of 21 definately beats the DC 12. You take half damage which is soaked by the elemental resistance I believe.
Ceric Magics into better position on the dragon's back. I don't recall all of you having flight. Only Junchiro. Correct me if I am wrong. I will give you the benefit of doubt this round.
Awveyen misses with an arrow.
Ragnar hits with all his attacks.
The dragon activates it's frightful presence DC 20 WILL vs Fear. and withdraws from combat. taking safety on a rock wall almost 400 ft. away.
If no actions at stated it will burrow to safety and combat is over.
Junchiro you may change your actions if you wish.
Dragon 152 damage...so far.