Two Anthropic engineers built a prompt system that spits out a rigged Blender monster in minutes, and the trick is that it never designs the creature It designs the skeleton first. Anatomy decides what a creature can do, and everything strange gets added on top of something that works. > FRAME - limb count, joint positions and weight distribution set before any mesh exists > FLESH - muscle volumes grown onto that frame, so the silhouette follows the structure > WARP - the strangeness applied last, as deformation rather than invention Image-led creature generation looks incredible and falls apart on the rig. Limbs bend in places nothing could bend. Starting from a skeleton flips the failure. The monster may look wrong on purpose, but it always moves like something alive. The warp stage is where the personality arrives. Stretch one limb pair, collapse a joint, invert a spine curve, and it reads as a different species. Because the frame is parametric, every variant is one number away. A hundred monsters cost barely more than the first. Weight distribution is the detail everyone skips. It decides posture, and posture is what makes a creature look dangerous or sick. Studios build this knowledge into one senior artist. Here it sits in a prompt that any junior can run. The full prompt chain and a batch of monsters from one frame are laid out underneath.