One Shot Everything in PoE 1's acts while leveling through the campaign on league launch with flameblast trypanon marylene's fallacy assassin. Check out the POB below where I tried to snapshot my character for each difficult one shot.

This was all done during the Keepers of the Flame league launch for PoE 3.27 so it should be able to be replicated on league launch weekends.

Path Of Building:

NOTE I tried to snapshot all of the key upgrade moments and big one shot moments using loadouts, so you should be able to byble through the loadouts in PoB proper to see everything. For some reason the active gem often changes or disappears when switching loadouts though so be careful to make sure and select the right flameblast. I also had some issues with gems appearing multiple times in PoB. This is my first time trying to share a PoB so please have patience with me and feel free to make any suggestions in the comments on how to improve the shared PoBs!

Pastebin: https://pastebin.com/UrsCNMaM

Pobbin: https://pobb.in/UrsCNMaM