Hello Neighbors,
Like with all events in Dragon Story, a common dragon needs to bred to advance the progress. The dragon needed for the current event is the cool looking Sea King Dragon. There are two major ways to get this dragon. One is to breed it by breeding red and yellow (or a couple of alternative combos). The other way, which is the usual case for most players, collect 15 Omega Crowns to craft the dragon in the Spell Shop.
On my secondary account, I bred Sea King by breeding Tropic (tropic) with Rustling (yellow, red) on the second try with the combo. Have to craft this on my main account because of horrible fails.
Here's the egg to look for if you're breeding:
Good luck to all of you!!!