The Shadowscales are an organization of Argonian assassins from Black Marsh. Those Argonians born under the sign of the Shadow are given to the Dark Brotherhood at birth to be trained as professional killers. Although they worship Sithis and obey the Brotherhood's tenets, the contracts given to Shadowscales serve only to aid the Argonian people, and they act with impunity in Black Marsh.
The Shadowscales opposed the formation of the Ebonheart Pact due to their hatred of their former slavemasters, the Dunmer. Shadowscales can be encountered at Stormhold, Murkwater, Sunscale Strand, Loriasel and the Gray Mire.
- The Gray Mire — A community of Argonian refugees in southern Grahtwood, just east of Southpoint.
- Loriasel — An Ayleid ruin in southwestern Shadowfen.
- Murkwater — A village in southern Shadowfen.
- Stormhold — A city in northern Shadowfen.
- Sunscale Strand — A ruin in southeastern Shadowfen, southeast of Alten Corimont.
- Three Tender Souls: Solve a series of crimes in Stormhold.
- Scales of Retribution: Help defeat the Dominion at Murkwater.
- What Happened at Murkwater: Let Hissmir know of the events at Murkwater.
- Pull the Last Fang: Recover a Fang of Sithis from the Renrijra Maor.
- The Swamp's Embrace: Recover the bodies of the Dominion's Argonian prisoners.
- Scars Never Fade: Investigate the Argonian refugees in the Gray Mire.