Guild Wars 2: Sea of Shadows
Location: Unending Ocean
New Playable Race: Largos
New Mount: Megalodon
It could consist of 5 Acts.
Act 1: Largos Personal Story
Act 2: The Pact and the Largos meet and form an alliance.
Act 3: The Pact discovers a Dragon egg belonging to Bubbles and transports it to the Largos city to be protected.
Act 4: Bubbles launches an attack against the Largos city in an effort to get back its egg.
Act 5: The Pact forms a counteroffensive against Bubbles, killing it. Bubbles' death releases a massive amount of energy that is absorbed by the Dragon Egg.
The following Living World Season could be about Aurene training the new dragon. I also thought, what if there were more dragon eggs, and what if each one chose a different member of Dragon's Watch to be it's "partner", in the way the Commander and Aurene were. The new dragon egg could choose the Largos.
I've read many forum posts about potential problems with adding a new playable race and underwater combat and I've thought of a few potential solutions.
New Playable Race: The issues normally presented are armor models and the Personal Story.
Since the Largos are humanoid creatures, they would use the same model as humans, so that wouldn't be an issue.
As for the personal story, I thought of something implemented in the first Guild Wars games. Obviously, Largos characters can't be the Commander, since they weren't around for the forming of The Pact and the events of the core game, Heart of Thorns, and Path of Fire. But what if they didn't have to be? Largos characters could be new members of Dragon's Watch. And the Commander? Character Heroes. Heroes were introduced in Guild Wars Nightfall as a more customizable party option. Shortly before the release of Guild Wars 2, Character Heroes were added to the game. The idea was that you could turn a character you had created and played into a hero that other characters could use. My idea works similarly. You would choose a character you created to become your Commander, and when playing your Largos, they would appear when playing any mission that would involve the Commander.
Underwater Combat: While I don't have any personal qualms about underwater combat, many people do. To help, I have a couple ideas.
One complaint I see often is movement. The additional dimension of the Z axis is fun but can be troublesome to some people. I think the simple idea would be to add a button that allows travel along the Z axis. While space lets you ascend, there is no button, that I know of, that lets you descend.
Additionally, many people have problems with profession balance while underwater, and it's pretty noticeable that some professions excel in underwater combat, and others don't. The solution would be to rework underwater combat for specific professions. Adding new weapons and skills would greatly help. And adding a new underwater mount would help with travel.
So, let me know what you think, and if you have any ideas to add.