I really don’t recommend killing Empress immediately after Plantera, especially during the day. A lot of unneccesary effort when Summoner already has enough to prosper during post-Plantera, and you really shouldn’t need the equivalent of a Moon Lord drop to powerforce the part of the game Summoner does the best at anyway.
If you do, however, I strongly recommend Desert Tiger over Sanguine. 1.4.1.2 gave it a buff that basically makes it act like Flinx, allowing it to actually keep up with and has incredible for single target DPS (although somewhat lacking in crowds). Note that it’s bugged if you stop time.
I’d honestly write the guide assuming the player is more casual and isn’t gonna try to rush Empress instantly. In which case, progression after Plantera would be
-Tiki or Hallowed Armor, Desert Tiger and Morningstar
-Pumpkin Moon for ravens and dark harvest andvarious upgrades, then ravens and dark for martians. Usually desert tiger synergizes better with firecracker, but use it alongside morningstar for the first few waves.
-Ravens and dark harvest for martians, to get xeno
-Xeno and morningstar to get kaleidoscope
-Xeno and kaleidoscope into pillars
-Dragon and kaleidoscope (firecracker’s range becomes lacking)