I said I would only run this boss if I had something new to add to the route, so here it is. The exploit I use to change my player physics was found by hatchlender. If I had not made a mistake burning my science machine, I could have had the first day 3 unseeded run.
timestamps:
00:00 - generating a new world
01:45 - knight head and resources
02:55 - pig king
05:28 - chess board found
06:05 - moving chess pieces
09:06 - rushed crafting
09:44 - shadow pieces fight
11:20 - breaking alch too early :)
13:25 - collecting fossils
16:00 - looking for mud
17:35 - looking for ruins
21:56 - looking for labyrinth
22:36 - ancient guardian
24:00 - looking for atrium
24:40 - atrium located
25:06 - fuelweaver fight
26:58 - run ends
27:27 - mods/world settings