Ending a show is not easy — and the process is different for everyone. That was just one lesson learned during the drama series panel at the Variety A Night in the Writers’ Room event in Los Angeles. First, both Eric Kripke, showrunner and executive producer of Prime Video’s “The Boys,” and Matthew B. Roberts, showrunner, writer and executive producer of Starz’ “Outlander” and “Outlander: Blood of My Blood,” opened up about crafting their upcoming series finales. “It’s really nerve-racking,” says Kripke, whose series finale will air on May 20. He noted that the super hero genre is usually “retroactively judged on the finale,” which adds a bit of pressure. “If you stiff the finale, they’re like, ‘I guess that wasn’t such a good show.’ It’s unfair and shitty, but it’s true.…