From the Deep is a short story by Jaine Fenn which tells of the fight against chaos by the Sylvaneth Water Spirits that dwell beneath the Sea of Serpents.
Whilst tending her kelp forest, the Naereid Kelara and her sisters are attacked by Chaos warriors in the service of Nurgle. Having escaped their attacks in the previous age, she and the other Sylvaneth must not only fight to survive but decide if they will take part in the greater conflict for the Realm of Ghyran. 
|Resistance is not enough! While Queen Alarielle rests in her sanctuary, the ruination grows unchecked. We must join with the sylvaneth, and all those in Ghyran who remain faithful to the Everqueen, and combat this threat. How can you just stand by?
~Kelara to Usniel, the Lord of the Deeps.