A Return To Your Roots

This quest is started in Blackreach by collecting a crimson nirnroot.

Walkthrough
The Dragonborn must find Sinderion's Field Journal, which instructs them to find thirty crimson nirnroots.

Crimson nirnroots, unlike normal nirnroots, are found only in Blackreach. Crimson nirnroots still make the sound of chimes when they are nearby and have a white/yellow glow emanating from them. Going into audio settings and turning the music down will make the chime sound easier to hear.

When thirty are found, the Dragonborn can bring them to Avrusa Sarethi, located to the southwest of Rift Watchtower, at the Sarethi Farm.

The Dragonborn is rewarded with the Nirnroot Missive book and the Sinderion's Serendipity active effect.

Trivia

 * The name of the quest, "A Return to Your Roots," is a reference to the quest, Seeking Your Roots. Both quests involve Nirnroots and Sinderion.
 * Clairvoyance can be used to locate crimson nirnroot while the quest is active.
 * This has been removed in Patch 1.9.
 * There are at least forty-four crimson nirnroots in Blackreach, so it is not necessary to find them all.
 * While they can be found anywhere on land, Crimson nirnoots are still found more commonly near water. One is in the central pool of the Derelict Pumphouse, while another is found far from water, high up where the frost trolls live.
 * Crimson nirnroots will respawn after ten days. Harvesting them will still count towards the quest.
 * Crimson nirnroot cannot be grown in a garden or greenhouse.