In the past, the Thunder Seed was deeply hidden within him; he could mobilize the golden thunder within, but he couldn't extract it as easily as he does now. The Thunder Seed was like his second heart, important and lethal.
But now, this Thunder Seed is completely under his control; it is no longer as lethal as a heart. The Thunder Seed is just a Thunder Seed, and even if it is destroyed, he can rebuild it. This is one of his abilities after becoming a Thunder Eater!
In fact, he can completely throw the Thunder Seed to detonate the power of thunder within it and use it to destroy strong enemies.
As long as the Thunder Seed is nurtured strongly enough, throwing it out would be comparable to deploying a nuclear bomb, an absolute killing move, just like great demons detonating their heart cores to perish together with their foes!
The difference is that a great demon detonating its heart core is actively seeking death, while he doesn't have such a cost.
