I full on believe that while the oceanides are Genshin equivalent of mermaids their mother egeria is a siren or lady of the lake
Egeria can emerge from any body of water and uses this to go give people side quests. Kaveh is one stop at Harvisptokhm from getting a commission to build her a underwater palace
Egeria is mixture of the pride of the dragon race with the aggression of the primordial race. She is a menace. While the oceanides were made out of sugar spice and everything nice. However they have inherited their mothers some what crazy behavior *cough* ianeira casting explode gall bladder *cough*
Egeria is literally said to have driven a women who she has never met face to face with to destroy an entire kingdom. The idea of egeria got Remus of remuria stabbed fifty times. Remus probably had night mares of this women clawing her way out of the depths of the ocean to destroy him because of that. She is such a menace her mother had to force a dragon prince to gaurd her to stop her ass from escaping
Furina is going to sit on a rock and sing “part of your world” while egeria is drowning some sailor who dared to hit on her daughters
