Ves brought him images into reality by visualizing their life cycle. The more details he added, the more vivid they behaved.
At some point, they started thinking on their own. His creativity ran out of control and filled in some of the gaps that Ves had unconsciously left behind.
For example, the knight mech yearned to increase its defense. Even as an offensive-oriented mech, it expressed its dissatisfaction with the current design's inadequate armor cover. Ves skimmed off a bit more off its armor plating than usual in order to keep the weight down.
The totem animal on the other hand didn't care so much about the armor. Instead, it yearned for a much more effective offensive kit. Hexapod kings proved their strength not by acting like a turtle, but by threatening its rivals with overwhelming might.