A 9-foot tall, 4,000-pound amphibian-like creature with a hunched posture, gray coloring, and vicious claws
A Gray Render stands about 9 feet tall in spite of its hunched posture and is about 4 feet wide, weighing about 4,000 pounds. It has a very amphibian, toad-like look, and is gray in color. Its forelimbs are rather small compared to its body, but has viciously sharp claws. A gray render has no eyes; instead, it depends on sound to locate prey (treat as 90-foot Darkvision). Thus, a silent opponent is as good as invisible to the monster. A gray render is never found in groups. When hunting, it hides and waits for prey to wander close.
Basic Fantasy Field Guide Omnibus