The first time I built a pyro Qiqi I was only able to get her to deal a bit over 305K damage (but hitting 3 enemies at once so if you want to add those up and call it over 900K I won't object). Years later she's doing more than 8 times the damage with today's hit for 2,511,657. The boss can provide another 5 buff stacks if the curse doesn't kill off the team so there's still room for improvement but I'm happy with the 2.5M for now.