The name Rashaverak refers to both a species and an individual monster, both demonic dragons and the former one of Psaro's four servants who maintain the barrier surrounding Castle Nadiria. Subsequent appearances are as regular (albeit vicious) enemies in the end-stages of games.
Rashaverak is one of Psaro's top generals and guards one of the four barriers surrounding Castle Nadiria. He is triplicated when he appears, and can summon more of his species in battle if the original ones are defeated. They attack with superheated gases, though the power of these attacks can be greatly reduced with Insulatle. His dialogue as he dies indicates that Rashaverak is loyal to Psaro, unlike many ofhis hellish peers.
Rashaveraks appear in the wild at the lowest floors of the Old Man's Gate, the gate of dragons. The easiest and most well-known method of breeding it is with any dragon as the pedigree and a Bad apple as the mate. Either Rashaverak or Great dragon are required for breeding Dragonlord and Orochi.