Time and kill count.
Showing difficulty, also I got the handwraps! Which I'll never use.
Obviously, three kills is not possible without having the runes beforehand. So count it as an exploit run if you wish, I don't mind, but this is the absolute minimum kill count and I might be the only person to have done this, and that's what matters
Time would have been 23 mins or so had I not gotten blown off once. Avoiding getting blown off was basically the only challenging part of this "run", I would have reset had I not already done so twice beforehand (and I was tired of wasting my scrolls of PWK on the Fire Giant), however I figured out how not to get blown off after that as melee.
If doing an actual run, the theoretical minimum kills would be:
3 - Iron Golem and Reavers to unlock portal to Fire and Ice. Iron Golem can be a "Misadventure" kill if you instead unlock the control thingies.
2 - Reavers in Fire and Ice
3 - Drow required to unlock portal to Flooded Tunnel. It is just two or possibly one if the red-named near that portal spawns
1 - Scorrow required to open the gates to the Drow
5? - Drow required to be killed to "summon" beholder. Not 100% sure it's five drow, but I know for certain that the Scorrow after the first one do not need to be killed though it may just be number of mobs killed in this part. More testing required
1 - Beholder in Flood Tunnels
1 - Fire Giant required to unlock the gate to Sor'jek and the Bridge to the Inevitable
12 - Drow and Scorrow Ambush in after the bridge. The gate may also open on a timer and/or if everyone inside dies, more testing required
1 - Iron Golem required to drop the barrier to the inevitable
1 - Hill Giant needed to be killed to trigger the Inevitable
1 - Inevitable
1 - Beholder to open portal to Sor'jek
1 - Sor'jek
=~33 kills, 32 or 31 with the red-name before Flood Tunnels portal, 21 if you can skip the ambush which may or may not be possible, but all other kills are most likely absolutely required.
So yeah, perhaps I'll do that someday, or perhaps some stealth aficionados on Thelanis who'd be willing to do so could join up and we'd do it on LE. Group stealth is something I've wanted to do forever but I've never met more than one or two people (in-game) who are into it.