Large, durable iron helm, known as a heaume.
This helm with a red feather is said to have belonged to a Knight of Sunlight in a previous age.
The heaume has no particular powers, but is of fine quality, and appears to have been looked after with the greatest care
Can be obtained from Pickle Pee in return for a Lightning Urn. (only once per playthrough)
Note that in Dark Souls 3, you do not need to reload to complete the trade. Dropping the item inside the nest is sufficient.