VS = Void Strike from the Madurai skill tree
Video to show what's up:
https://youtu.be/ch2o_rO9DTg
You need a Trinity to Bless the lures, and she's probably the easiest to play...just Bless (build isn't even that critical). When I'm playing Trinity, I usually just focus on taking out the little Eidelons and let my teammates focus on the big guys. Everything else is negotiable, but I like to have someone to protect the squad during energy spikes. I prefer Harrow, but Oberon works fine too. People still ask for Chromas, but VS makes Chromas role academic since everybody can one-shot the limbs.
Whatever amp you're comfortable using is probably fine. I prefer the Schwaak Prism, but everything attached to it is purely taste.