An ability called Blackout allows him to suck away all the light in the area...

And let it out in burning often near or completely blinding blasts or disintegrating waves of energy.  But the most terrifying is how he can turn sunlight into something deadly creating painful constructs that can't be seen with normal slight but can cause untold pain..

"If I really wanted to I would use all the sunlight, people absorb and use it to-"