What if angler-fish seatrolls?
This thing apparently?
In my headcanon (likely Jossed multiple times) There are trolls in between Feferi and Aradia with magenta blood who live way deep in the ocean. The reason Feferi is seen as the highest a troll can go is because deep sea trolls are so violent and feral, they aren’t even considered trolls. (Fridge horror when you realize how violent trolls are) Seatrolls would kill them on sight, but the water pressure where they lived made genocide impossible. As troll technology evolved, the only thing keeping them alive was the fact they were thought to be a myth over the years, and is now a bed time story lusii tell their trolls so they don’t swim too far down.