- Collect thirty samples of the mysterious Crimson Nirnroot.
- Take these samples to Sinderion’s colleague Avrusa Sarethi, so that his research may continue.
The quest begins upon the collection of a Crimson Nirnroot sample in Blackreach. You will be required to find out the significance of this plant, and in order to do so you should head inside Sinderion’s Field Laboratory, which is located right across the gates back to Alftand Cathedral. Inside you can find Sinderion’s remains, still clutching his field journal. After reading the journal, the quest will update, and you will be required to collect 30 Crimson Nirnroot samples across Blackreach – a difficult but rewarding task.
Crimson Nirnroot, unlike the more common garden variety, does not solely grow near bodies of water. Many samples can be found by patches of mushrooms, Dwemer pipes or along the sides of the cavern. There are also several plants located inside different buildings in Blackreach, specifically:
- Sinderion’s Field Laboratory – inside a pot.
- Derelict Pumphouse – underwater, requires you to use crank and open the gate first.
- Silent Ruin – inside a pot.
- Hall of Rumination – actually not inside building itself, but on platform above it. Enter through Hall of Rumination and fight your way to a door leading upstairs. Plant is in a pot, behind entrance.
Additional plants can also be found at following locations:
- Stream near the Hall of Rumination is a tunnel entrance. In the tunnel.
- West of Derelict Pumphouse at water level and against edge of cavern is a small shrine. In a pot.
- North of Derelict Pumphouse is an elevator to Skyrim. East of elevator below falls and at water’s edge.
- West of Raldbthar Deep Market at the bottom of the water fall and at river’s edge.
- West of Raldbthar Deep Market in lake at bottom of falls is a small island. On the island there is an entrance to the Derelict Pumphouse.
- Starting from the entrance to War Quarters, head south down and then up stairs. The plant is on the ground to the right.
- North east of War Quarters, will see a small building. At bottom of steps leading up to building.
- Several steps north east of previous listing.
- South-west of entrance to Raldbthar Deep Market in a stream, at the top of the waterfall.
- Behind Slient Ruin.
After collecting the required number of plants, the quest will update again and you will be asked to deliver them to Avrusa Sarethi, Sinderion’s former colleague. She is currently residing at Sarethi Farm, between Riften and Ivarstead.
Give Avrusa 30 Crimson Nirnroot samples to complete the quest and receive The Nirnoot Missive. You will also be provided with Sinderion’s Serendipity, an ability which provides a 25% chance to mix two potions instead of one.