"...powerful centaur." Tobias looked at Mika hopefully. The wizard had to grin. "Well, I sure have enough experience with the horse parts. I'll try it."
Mika tried to clear his mind and then pictured a huge draft horse-based centaur, young and handsome. Then he used the stone.
Tobias blinked, and then gasped as he began to swell out rapidly. The child matured quickly into a young teen while his body below the waist expanded and changed into the massive form of a Clydesdale stallion. The transformation was very fast, but Mika got distracted as it was finishing up and then cursed himself as the last changes settled into place.
"What's wrong?" Audrey frowned at his burst of profanity, but then chuckled as she realized what the problem was.
Tobias's horse parts were golden brown and white, his coat glistening in the sun like a noble's animal, even the heavy white fathering around his hooves brilliant white. However, the animal hide continued up the muscular human torso and arms, and also covered the very equine-like face of a young equitar. He had a partial muzzle and the eyes, ears, and nostrils of a horse. The new centaur twisted around to look at himself, then felt his face.
Mika flushed. "I'm sorry. I was so focused on making you powerful like a Clydesdale, I slipped up and just pictured a real horse. Guess I went too far."