Here's a L1 bosskill using an Orc Transmuter:
So Den of Danger lit up, and I saw that Transmuter is the last badge missing. I decided to go low-prep, brought the Guitar to get rid of the walls, and prepped GG because Humility rocks. (I somehow thought that it will be Western Jungle, I'm not sure why, so I felt the Transmuter is really good to tap into all that otherwise unreachable blue-space.) When I saw the wimpy boss, I decided to try an L1 bosskill, but I didn't want to take any of the obvious shortcuts. So I wanted to do it without killing anything or getting any XP - so no Humility -, without drinking potions, and without using up the Guitar (it's costly to re-locker, and well I hadn't intended to fire it off anyway). Luckily I found some cool items like the Badge of Honour. Since I boosted base damage to pretty high levels, PISORF did a lot of damage, which was nice to round up the massive melee damage. I could have chosen to use up the guitar and land a second melee hit, but instead I took a bunch of Protections to be able to cast more PISORFs. I'm thinking that prepping for this via potions / DP would've made the L1 bosskill possible even on a regular boss, even without PISORF.
Those early Absolutions were useless, I started taking them before seeing the boss and deciding on the L1, but since I had no resists, my health was not enough to take even a single hit...
"Thinker", just without the "ache".