syrviathan 

A syrviathan si-(r)-via-than is a mix of a siren (a evil mermaid) with a sea monster (like in the movie "Luca"). They are mystical made up creatures that are extremely evil and mysterious.

"I saw a syrviathan swimming in the ocean."

syrviathan by i made it up July 28, 2021

Syrviathan 

A Syrviathan is a mix of a siren (an evil mermaid) mixed with a leviathan (a sea monster. like the ones in the movie "Luca") they are mystical made up creatures that are extremely evil and mysterious

"I saw a syrviathan swimming in the water."

Syrviathan by i made it up July 28, 2021