This monsters name is Gogmazios.Gogmazios is a massive Elder Dragon that boasts an exceptionally long lifespan and has existed since ancient times, retaining a more primitive appearance from ages long past.
Using its massive wingarms, it habitually employs a hexapedal gait in a manner similar to what can be observed in the Magala family of monsters, supporting its body on all six limbs. Unlike the Magalas, however, the Gogmazios is additionally able to rear up onto its hind legs and enter an upright posture, supporting itself for prolonged periods of time using its gigantic forelimbs.
This particular set of forelimbs resembles a pair of skeletal wings whose membranes are greatly tattered,making them poorly suited for actual flight.