Twenty Miles Beneath the Sea Quest/Spoiler

Method
Go to Brandon west of Rathleton to start this quest.

Talk to Guardian of the Deep Seas to continue it.

Mission 1
Complete the first mission to obtain access to the first hunting ground within Seacrest Ground.

Mission 2
Complete the second mission to obtain access to the second hunting ground within Seacrest Ground.

Mission 3
Complete the third mission to obtain access to the third hunting ground within Seacrest Ground.

The Fire-Feathered Sea Serpent
When 1000 Seacrest Serpents have been killed across the server, a world change initiates. Instead of Seacrest Serpents, Renegade Quaras will roam the Seacrest Grounds.