The Lost Seekers

The Lost Seekers is a story arc that is most often referred to as "The Waterworks" because that's the area where you find the four quests that make up the story arc.

The Lost Seekers
The Lost Seekers is the principle levelling tool of many adventurers through level 2-3.

This four part instance is known for being both generous, in terms of xp, as well as having amazing quest rewards for the levels. Many pieces of equipment found here are worn by adventurers well into their later seasons.

Further details are on the static reward list

The Kobold's Den

 * Clan Gnashtooth
 * Rescuing Arlos

Venn's Trail

 * Clan Tunnelworm
 * Venn's Fate

Related Flags
These quests show up in your quest journal but have no XP or patron favor.

Gone Missing
Explore the Waterworks and find Guard Tember, who gives you actual quest of the Lost Seekers.

Reward List
Waterworks reward items