He had also discovered something crucial during his forced introspection: the Soul Stones he had devoured had not disappeared. Sure, they had been digested by some unknown process, but the Naequat and Flintium ores were still in him under another form.
The atoms of these two otherworldly materials had amalgamated together and had invaded most of his cells. This was a big part of the reason why his Myrtharian bloodline had undergone a power-up.
Because his body had a higher than normal temperature and the ability to generate its own radiation, the energy inside the Soul Stones was completely snuffed out and harmless right now for better or worse.
On the other hand, it had also provided him with a simple way to counteract the noxious energy of these crystals. He could already produce heat, light and radiation before his bloodline had evolved, but his control had been somewhat limited. Among other things, he had been unable to consciously produce ultraviolet waves.
Congratulations to those who saw it coming in the comments