As Ben grows older, so do his aliens. As one of Ben's toughest aliens, there's not much you can improve upon with age, other than pure skill and training. Diamondhead has grown more crystal shards around his body, granting him even more defense than ever before, which allows Ben to focus on his older abilities instead of having to learn new ones. Along with that, Ben has learned a new trick with Diamondhead's species specifically, allowing him to call on a sturdy, Crystalsapien-like obsidian coating that encases his head when in danger, protecting him from any trauma to his head itself, making Diamondhead an absolute juggernaut of strength. While the armor protects his head from trauma, the tradeoff is decreased visibility and precision.