If you wanna get fancy, call it Chiaroscuro.
Whatever you call, it's the third episode of the light series, going over several ways of dealing with very few lights to get a more dramatic and captivating look.
This one has some exclusive content for patreon! (I mean technically there's the same content in the regular video as well, but I sped it up by like 3000%. In this video, I left it on just regular fast speed just in case you want to follow along. I didn't narrate the whole extra footage but I explained roughly what I was trying to do).