Contained Sun

For the duration of the spell, you harness the chaos around you and focus it into a single point within range creating a miniature sun. While active the sun sheds bright light up to 100 ft, and dim light for another 200ft. Maintaining this spell takes all your focus, and hence you have disadvantage on all checks until you release the spell. Anyone that comes within 5 ft of the sun must make a dexterity saving throw or take 3d6 radiant damage.