Pelogi Whales, also known as just Pelogi or (when solitary) Elu, are found in the Topazial Sea.
Pelogi are immense creatures, a adult may be as large as a Leviathan mermaid, with legends abounding that the farther east you go, the Pelogi get even LARGER. These marine creatures have a very curious appearance, however, which is not very whale like at all. They are rather flat, with a thick hide and six 'paddle' like limbs, three on each side, and a bizarre long, winding tail which ends in a large wedge shape. Their heads are described as nightmareish, sixteen 'small' eyes, the skin on their skulls often appear to be deeply scarred with almost runic shapes. The heads are also, rather then having a lower mouth, have a mouth which splits their head in half horizontally, revealling a massive and stretchy maw.
Pelogi are, naturally and usually, a very gentle species to most. They often swim in deeper waters in pods of up to twelve (although pods of thirty have been spotted), and they only eat schools of fishes, cecalia, and sometimes giant chlaena. They also have a curious habit of eating large swaths of sea sand, and no one is quite sure why, although some have proposed it's to make digestion easier.
Others, like mermaids and even the occasional human, have swam alongside Pelogi and naturally feel safe. Sometimes you can spot a school of mermaids catching a ride on one of their backs! Pelogi mate for life and have a gestation period of eight years. Pelogi have single births, and it takes fourty years for the Pelogi mother to be reproductively viable again. Pelogi calves stay with their mothers for fifty years, and most calves are born at twenty feet long. When adult, female calves will leave the pod to join another, while males stay behind. Pelogi are also strangely proficient in water magic, leading some to suggest they may be elementals, but they are not.
Some underwater communities regard Pelogi as sapient, but their intelligence is so foreign it is impossible to understand them.

However, there is a dark side to these gentle giants. Very rarely, for some reason that not even the vetealas know, an entire pod will go mad. These are classified as a species unto their own.
Inverted Pelogi WhalesInverted Pelogi whales are different from normal Pelogi. For one, their skin, especially the hide on their head, appears to ripple and move as though it has a mind of it's own. Their eyes become blank and blue, and their 'paddles' become longer and bone protrusions appear out of them. The Inverted will eat their calves and then proceed to swim, never eating, never stopping. Through this trek, they sing a bizarre song, beautiful, haunting, and chilling.
Their final act is what they are most known and widely feared for. The pod of pelogi will swim upwards to the surface, but rather then breaking out of the water, they use their magic to surround themselves, continuing upwards until a giant wall of water appears, then they swim forward, creating a massive wave of water.
This water appears dark, a rather purple like color in fact, and any craft to be caught in this water is torn apart, the men aboard killed instantly.
The Inverted continue swimming, but by this point they are so weak, they will begin dropping out of this bizarre tsunami, hitting the water and causing huge waves of this dark water. When only one Inverted remains, the tsunami will dive downwards with such force, the remaining Inverted's body is obliterated into a bloody mess.
The water will return to normal, and the fish and other species will eat well.