Cistern in The Ragged Flagon in Riften, appears on a shelf behind the desk after completing 15 Thieves Guild jobs. If using Destroy the Thieves Guild, it will instead be located in Gray Pine Goods in Falkreath, on a cabinet behind the counter.

Normal Location

The Ragged Flagon in Riften

Destroy the Thieves Guild Location

Gray Pine Goods in Falkreath

Community content is available under CC-BY-SA unless otherwise noted.