Windsong Eva

The Water Fey goes by the name Windsong Eva. She is a Fey deity of the Valley of Barovia who was worshipped by the Forest Folk who are the original inhabitants of the valley. She is one of The Ladies Three - a group of 3 Fey deities who were the original pantheon of Barovia.
The Water Fey held sway over the rains and the rivers.

The party saw mention of these deities in some Barovian literature

The druid Chulainn was the first knowledgeable person the party met who was able to share more information about The Ladies Three, however more specific knowledge regarding the Forest Fey and the Water Fey were lost to Chulainn.

The party learned the name of Windsong Eva when traveling back in time via the Tome of Strahd and speaking with the holy man Dawnmaster Gabriel Andral who was familiar with the old gods of the land.

Species

Fey

Aligned Organization

The Ladies Three