Vraska is a Planeswalker who wields a suite of deadly spells that suit her gorgon nature. She specializes in magic that involves assassination, stealth, and petrification.
During her time on Ravnica, Vraska has provided certain dark services to the Golgari guild. Her magic helps her track her chosen mark through the fungus-choked tunnels of the undercity, allows her to destroy her victims quietly, and when necessary, lets her summon shadowy killers to do her dirty work for her. The Golgari see her as a useful enigma, a shadowy death specialist who only responds to the jobs she wants, and who requests strange favors and obscure trophies in return. Vraska stays largely out of the guild politics on Ravnica and seems to care little for the inner workings of the Golgari Swarm. She gets the job done and departs again, not to be seen until there's another mission that interests her.
Vraska's power is clear, but her true motivations are a mystery, even to other gorgons. Unknown to the Golgari Swarm, she spends a significant portion of her time on planes other than Ravnica, using her death-dealing operations to build experience. She also gathers souvenirs of her journeys, slowly adding to her collections of trophies and petrified victims across many worlds.