Lena shifted weakly, and her hand reached out ... trying to cling to Conner's, not Lex's.
Lex didn't seem to notice, and shook his head. "No, I perfected it. I exposed her to kryptonite radiation before that attack ... she showed no signs of discomfort." He went silent, staring at the screen where Lena's weak vitals were projected.
"...But I only tested for ..." He paused, expression shifting. "Because it was the only kind that would harm her. There was no need to prevent for the others..." He turned abruptly, attention back to Conner. "There's a vault here, hidden away ... hopefully untouched ... containing other kinds of Kryptonite. The red. It gives your powers a significant boost, almost like a battery. The cure may be to slowly expose her to it over time."