[She lets herself slide a little closer to Garrosh, trying to tell herself it was to be closer to the fire.]

They are the keepers of the water. They are the ones who help the waters stay clear and fresh. They will protect the water from any who may harm it by taking too many fish. They allow dams to be made or will obliterate them if they are going to cause too much damage to the waters.

They also, long, long ago when the humans were low in number one of the creatures who blessed them with magic. So long as humans would not abuse their power and would help continue to protect the water as the water nymphs do.