First off, i wouldn't throw money at trying to summon a spotlight black. It's 3% and you might end up crying in a corner instead.

Secondly, i wouldn't throw money at the game in the current state it is in, but that's up to you.

That aside, i guess the second unregged answered it nicely, they're duelists. They also deal magical damage and can also work as lightning rods to take enemy magical attacks since they all come with resistance.