Dark Souls 3: The Ringed City has a lot of new content, including armor and weapons. Below you will find brief descriptions for where to find each of the major new items.
Dropped by the Headless Guard near the Old Hag upstairs from the Dreg Heap bonfire.
Herald Curved Greatsword
Located behind a Giant Knight in the toxic lake.
Ringed Knight Armor Set
Each item of the set is a low percentage chance drop off of Ringed Knights.
Ringed Knight Straight Sword
Located on top of a destroyed building near The Ringed City Streets bonfire.
Located under the ghostly archer squad in the Ringed City area. Follow the side path into the tomb area to find this set lying against a wall.
Purchased for 11,000 Souls from Old Hag near the Dreg Heap bonfire.