Balrus was strapped to the pole with robust ropes. He struggled violently, but it was to no avail and the pit slowly began to fill with the glowing liquid. The man paused in his exhausting attempts to set himself free and looked on with horror as the liquid oozed closer and closer to his feet. It was now within inches and he stood on his toes to dela any effect the liquid might have when touching his body. "It will only be a temporary reprieve. The entire pit will be filled with the substance eventually," he despaired just before the liquid touched his toes... The man had been lucky. His friends got there just in time; cut him loose and pulled him out of the pit. His toes that were touched by the liquid, however, were different...
How do would you deal mechanically with a creature only a miniature part of which has been transformed into another creature. In my example, Balrus's toes are transformed into dragon toes (claws). Could this conceivably have any mechanical effect (I am a big fan of mechanical effects reinforcing flavour)? Perhaps Balrus cannot wear normal shoes anymore... any other ideas? How about if some other small body part such as ears had been affected? How would you deal in general with similar kinds of minor/partial transformations?