Afanc

Once a chosen prey is within range of its strike, the afanc would burst from the water and pounce on its target, latching its jaws on the victim's neck or back before biting with tremendous force to instantly snap it. If the prey manages to survive this initial assault, the afanc would drag it back into the water and try to drown it. 

The monstrous afanc has the body and head of a 12-foot-long giant beaver, the limbs and jaws of a bear, and the claws, spine, and tail of a crocodile. Underneath the fur of the afanc is a tough armor-like hide covered with scutes similar to a crocodile's that can resist most blows. The afanc's crocodilian tail ends with a large, paddle-shaped plate identical to a beaver's tail. The afanc is always invisible before it attacks, appearing when it strikes. Once it has killed its prey, it immediately turns invisible again and retreats to its lair with its prize where it can feed in peace.

Older afancs are even more dangerous. By simply slamming their tails on a surface, their paddle-shaped tails vibrate and create supernatural waves of force that the afanc can direct, instantly killing most creatures hit by them. Afancs sometimes use this ability to create a tidal wave or whirlpool strong enough to overturn a small boat to toss its occupants overboard.

An afanc is usually encountered alone or as a mated pair. Rarely are there more than two in the same territory, but if a large group exists, it is most certainly led by an alpha.