Mavadtorop

Based on your description, Mavadtorop is an aboleth - an ancient race of immensely powerful aquatic beings. I could find no references to anything calling itself "Mavadtorop" in my research; perhaps that is just one of many names the creature goes by. Little is known about aboleths, but I have summarized what I could find below.

Aboleths

 * Aboleths are possibly the oldest of all creatures and their natural lifespan is endless.
 * Aboleth have a variety of holes across the front and side of their bodies - these are mouths, not gills.
 * One tome I found suggests that the number of mouths is important as they can be used to determine the aboleth's age and intelligence. An older and more powerful aboleth will have many mouths: the more mouths they have, the more tones they can make at once, which is an indication of its ability to consider and reason its actions.
 * The Aboleth's skin functions much like a giant ear, it can pick vibrations and sensations throughout the water around it. This makes an aboleth very difficult to surprise in its aquatic environment.
 * The Aboleth's brain is absolutely massive, with the only recorded specimen having roughly 600 pounds of brain. The brain is so large in the creature that aboleths have a separate heart just to circulate all the necessary blood to and from the brain.
 * The strange thing about an aboleth, and likely the most important, is they have a genetically inherited racial memories. They inherit the memories of all their forebearers back to the first aboleth that ever existed.

Related Notes

 * Evidence: Mavadtorop's Visions