It is a hidden underground tunnel, of which leads to a large room with a green pile of greenmote, a refined version of Unrefined Greenmote.
Description[]
The Silo is only reachable during the "Ritual of Mania" quest, to find it originally one must follow Wide-Eye out to the Palace Grounds of New Sheoth, she will walk up to the Bust of Sheogorath and activate it.
This will cause it to open, revealing a door, which leads to the Greenmote Silo. It is recommended to use Stealth when entering this area.
Retrieve two Greenmote supplements by standing next to or on top of the pile and activating it 3 times, or as many times as one want.
Quests[]
Ritual of Mania[]
Sheogorath wants to replace one of the aristocracy of his kingdom: either Lady Syl, Duchess of Dementia; or Lord Thadon, Duke of Mania.