http://www.doctorwhonews.net/2020/05...s-release.html
Details on the first couple of Timelord Victorious books. Seems like the Doctor has gone all Anakin Skywalker stop-death-itself.
Maybe perhaps this is set between Water Of Mars & End Of Time, and possibly not quite an alternate timeline? Maybe the Doctor's kind of megalomania lasts a bit longer before he's relatively back to normal in "End of Time" (as well as his part of "Day of the Doctor") and his past selves have to step in to bring him back to sanity? (Although that sounds a bit like the War Doctor's arc in "Day of the Doctor" a bit too much)