Pelias is humanoid. He is an omnivore.

Conan cried out sharply and recoiled, thrusting his companion back. Before them rose the great shimmering white form of Satha, an ageless hate in its eyes. Conan tensed himself for one mad berserker onslaught-- to thrust the glowing faggot into that fiendish countenance and throw his life into the ripping sword- stroke. But the snake was not looking at him. It was glaring over his shoulder at the man called Pelias, who stood with his arms folded, smiling. And in the great, cold, yellow eyes slowly the hate died out in a glitter of pure fear-- the only time Conan ever saw such an expression in a reptile's eyes. With a swirling rush like the sweep of a strong wind, the great snake was gone.

"What did he see to frighten him?" asked Conan, eyeing his companion uneasily.

"The scaled people see what escapes the mortal eye," answered Pelias cryptically. "You see my fleshy guise, he saw my naked soul."

Conan the Usurper, by Robert E. Howard and L. Sprague de Camp