Jeweler

In the dark and twisted tunnels, where the sun rarely reaches, exists a cave of riches. More jewels and gems than you could ever imagine. A place where the houses are of jade and the rivers run ruby. The cave walls are said to be of amber and the cave roof of amethyst. Could there be a place more wonderful out there? The tales also whisper of people that live there. They are said to be most peculiar folk. Some of them have an arm of topaz while others gaze trough eyes of emerald. Those features have earned them the ironic name of 'jeweler' But do these people even exist?
 

Star of the depths

You are resistant to radiant damage. Upon receiving radiant damage you can use an reaction to harness that energy. That rection can be used to blind the attacker until the start of their next turn or to cast the light cantrip upon oneself.  

But a flicker in the void

  You are vulnerable to necrotic damage.